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Session_Xcas
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<div id="startup1" style="display:none">
  To display the <strong>tutorial</strong>, click on <button style="height:25px"  
  onclick="if(document.getElementById('help').style.display=='none')
  document.getElementById('help').style.display='block';
  else document.getElementById('help').style.display='none';"
  title="Show or hide tutorial">Tuto</button>.
</div>
<div id="startup">
  If Xcas does not work correctly, <a href="https://en.wikipedia.org/wiki/Wikipedia:Bypass_your_cache#Cache_clearing_and_disabling">clear your browser cache</a> and reload.
<hr>
</div>

<span id="apropos" style="display:none">
This is a full web-based CAS.
It does not need any server,
all the computations are done locally with the javascript
engine of your browser (requires Firefox version 19 or later,
or Safari,
the latest version of Firefox is recommended for good performances).
The code of the CAS is 12M, it is downloaded once then kept in your
browser cache
(giac.js javascript 
  compiled from native <a href="http://www-fourier.ujf-grenoble.fr/~parisse/giac/emgiac.tgz">Giac/Xcas</a> by emscripten).
  The javascript code is at least 2 times slower than the native 
code, and sometimes much slower (e.g. 8 times slower
for computing a Groebner basis like cyclic7). Most of the time
it is fast enough,
but it is recommended to run large computations with
  <a href="http://www-fourier.ujf-grenoble.fr/~parisse/giac.html">Xcas</a>!
<br>
  Giac/Xcas, (c) B. Parisse, R. De Graeve, Institut Fourier,
Université de Grenoble I., licensed under the GPL3, for commercial
licenses contact us.
Program editor <a href="http://codemirror.net">CodeMirror</a>,
Initial Mathml and SVG code by J.P. Branchard.
<br>
<button onclick="parentNode.style.display='none'">Hide</button>
<hr>
</span>

<form id="config" style="display:none" onsubmit="setTimeout(function(){
  UI.set_config();
}); return false">
<b>Configuration</b>
<table>
  <tr>
    <td>
      Digits:<input style="height:25px" type="number" name="digits_mode" title="Number of decimal digits (if &gt; 14 multiprecision, slower computation)" value=12>
      Autosimplify: <input style="height:25px" type="number" name="autosimp_level"
  title="0: none, 1: minimum, 2: maximum" value=1 max=2 min=0>
    </td>
  </tr>
  <tr>
    <td>
      <input style="height:25px" type="button" value="Radians" onclick="angle_mode.checked=!angle_mode.checked;"> <input style="height:25px" type="checkbox" name="angle_mode" title="Check for radians, uncheck for degrees" checked>,
      <input style="height:25px" type="button" value="Complexe" onclick="complex_mode.checked=!complex_mode.checked"> <input style="height:25px" type="checkbox" name="complex_mode" title="Check for default base field = complexes">,
      <input style="height:25px" type="button" value=" √ " onclick="sqrt_mode.checked=!sqrt_mode.checked"> <input style="height:25px" type="checkbox" name="sqrt_mode" title="Check : always factor degree 2 polynomials">,
      <input style="height:25px" type="button" value="step" onclick="step_mode.checked=!step_mode.checked">  <input style="height:25px" type="checkbox" name="step_mode" title="Check to display details for some computations" checked>,
      <input style="height:25px" type="button" value="worker" onclick="worker_mode.checked=!worker_mode.checked"> <input style="height:25px" type="checkbox" name="worker_mode" title="Check to run computation by a webworker">
    </td>
  </tr>
  <tr>
    <td>
      <input style="height:25px" type="button" value="2d" onclick="prettyprint.checked=!prettyprint.checked"> <input style="height:25px" type="checkbox" name="prettyprint"
      title="Check for pretty print" checked>,
      <input style="height:25px" type="button" value="Q/A on same line" onclick="qa.checked=!qa.checked">  <input style="height:25px" type="checkbox" name="qa"
  title="Check to display commands and results on the same level">,
      <input style="height:25px" type="button" value="Syntax highlight" onclick="usecm.checked=!usecm.checked"> <input style="height:25px" type="checkbox" name="usecm"
  title="Syntax highlight during edit of history levels">,
    </td>
  </tr>
  <tr>
    <td>
      History <input style="height:25px" type="number" name="history_width" value=1000
        title="Max history width">
      x <input style="height:25px" type="number" name="history_height" value=400
  title="Max history height">
      Output <input style="height:25px" type="number" name="outdiv_width" value=410
  title="Max width for an output field">
      x <input style="height:25px" type="number" name="outdiv_height" value=200
  title="Max height for an output field">
    </td>
  </tr>
  <tr>
    <td colspan=3>
      Documentation <input style="height:25px" type="checkbox" name="online_doc"
  title="Check for online doc (if Xcas is not installed)" checked>online
      <input style="height:25px" type="text" name="doc_path" size="60"
  value="/usr/share/giac/doc/en/cascmd_en/"
  title="Documentation path (appropriate for linux, on mac add /Applications)">
      </td>
    </tr>
  </table>
<input style="height:25px" type="button" value="cancel" onclick="form.style.display='none';  UI.focused.focus();">
  <input style="height:25px" type="submit" value="ok">
  <hr>
</form>

<span id="manuels" style="display:none">
  Xcas manuals <button style="height:25px"
  onclick="document.getElementById('manuels').style.display='none';">Hide</button>
  <ul>
    <li> Reference :
  <a href="file:///usr/share/giac/doc/en/cascmd_en/index.html"
    target="_blank">hard disk</a>,
  <a href="http://www-fourier.ujf-grenoble.fr/~parisse/giac/doc/en/cascmd_en/index.html"
  target="_blank">Internet</a>,
    </li>
  </ul>
  </span>

<table>
  <tr>
    <th rowspan=2>
      <button onclick="if(document.getElementById('apropos').style.display=='none')
      document.getElementById('apropos').style.display='block';
      else document.getElementById('apropos').style.display='none';"
      title="Show/hide informations about Xcas in your browser">
      <img WIDTH="48" HEIGHT="48" SRC="logo.png" alt="Xcas">
      </button>
    </th>
    <td>
      <button style="height:25px" onclick="UI.show_config()"
      title="Change configuration">Config</button>
      <h3>Session</h3>
      <span id='thelink'></span>
      <span id='themailto'></span>
    </td>
  </tr>
  <tr>
    <td>
      <button id="loadbutton_cookie" style="height:25px" title=""Click here to append a saved session to the current history" onclick="document.getElementById('loadfile_cookie').innerHTML=UI.listCookies();">Load</button>
      <span id="startup_restore" style="display:none">
      Previous session inputs
      <button style="height:25px" onclick="var s=UI.readCookie('xcas_session');UI.restoresession(s,document.getElementById('mathoutput'),true,false);">without</button>
      or <button style="height:25px" onclick="var s=UI.readCookie('xcas_session');UI.restoresession(s,document.getElementById('mathoutput'),false,false);">with</button> evaluation
      </span>
      <span id="loadfile_cookie"></span>
      <button id="loadbutton_file" style="height:25px;display:none" title="Click here to append a saved session to the current history" onclick='document.getElementById("loadfile").reset();document.getElementById("loadfile").style.display="block";'>Insert</button>
      <form id="loadfile" style="display:none">
      <input id="loadfileinput" accept=".xw" type="file" onchange="UI.loadfile(this.files);document.getElementById('loadfile').style.display='none'">
      <input type="text" value="cancel" onclick="form.style.display='none'">
      <input type="submit" value="ok" style="display:none">
      </form>
      <span id="history1" style="visibility:hidden">
      <button id="exportbutton" style="height:25px" title="Click here to export the session as a HTML file (filename in the next text field)" onclick='UI.savesession(1);'>Export</button>
      <button style="height:25px" title="Click here to save the session (filename in the next text field)" onclick="if (document.getElementById('loadbutton_file').style.display=='none') UI.savesession(2); else UI.savesession(0);">Save</button>
      <textarea id="outputfilename" class="filenamecss"
      style="font-size:large" title="Filename. If you want to overwrite files with Firefox, check Ask always... in Settings, General, Download">session</textarea>
      </span>
    </td>
  </tr>
</table>
<span id="help" style="display:none">
<button style="height:25px"
onclick="document.getElementById('help').style.display='none';">Hide tutorial</button>
<br>
A typical Xcas session will consist in entering commandlines that will
appear in the history. Sometimes you will also edit an already entered
command and reevaluate it.
The screen is divided in
<ul>
  <li> A panel of buttons to load a session, see manuals and
  configure. Once the history is non empty, additional buttons appear:
  save or export session, a link that you can hit to e-mail or clone a session
  (for example if your session crashed) or copy/paste, history/trash
  and variables handling.
  You can partially open an existing PC Xcas session from the File, Clone
  menu of the Xcas program (or <tt>xcas --online filename.xws</tt>).

  </li>
  <li> The <b>help area</b> where you will find short descriptions of
  commands you asked for.
  </li>
  <li> The <b>history</b> (empty when you start) divided into levels. You can
  move level up and down (button at the left). You can edit a level
  and reevaluate it (press Enter). You can move one level to the
  trash (press backspace button at the right), and empty the trash
  or recover levels in the trash (panel of buttons above).
  </li>
  <li> A <b>commandline</b> with buttons that will help you fill the
  commandline. You can show a <b>scientific or/and tool keyboard</b> (press the
  123 or menu button), then move the mouse near a button to have
  a short explanation on the corresponding command. You can enter
  the beginning of a command then press Tab or hit the ? button, this
  will show <b>completions</b> in the history. If you entered a valid Xcas command,
  a short online help will be displayed with examples, hit the
  corresponding buttons to copy one example, modify arguments and hit
  Enter to run the commandline.
  <br>
  Example of simple computation <tt>1/2+1/3</tt> or <tt>sin(pi/4)</tt>
  or <tt>sin(pi/4.0)</tt>.
  <br> Example of CAS computation, press <tt>menu</tt> then
  <tt>factor</tt> then <tt>?</tt>, observe the online help on the top
  of the page, you can click one example and modify it or just enter
  your expression to factor like <tt>x^4-1</tt>, then press Enter.
  <br>Additionnaly, inside Firefox on a PC, right-click will show a
  menu of many Xcas commands. See also <a href="#examples">below</a>
  for a few examples.
  </li>
  <li> A <b>console</b>, with messages from the CAS : parse errors or while
  running step by step commands like derivative. You can clear the console
  and control the height of the console.</li>
  <li> a Graph3d button to show or hide controls for the 3d graph
  canvas.
  </li>
</ul>
<a name="examples"><b>Examples of input:</b></a>
<ul>
  <li> Algebra : You can expand an expression with
  <button onclick="Module.insert(entree,'normal(')"><tt>normal</tt></button>
  for example <button
  onclick="Module.insert(entree,'(x+1)^4')"><tt>(x+1)^4</tt></button>.
  Conversely,
  <button
  onmousedown="event.preventDefault()" onClick="Module.insert(entree,'factor(')"><tt>factor(</tt></button>
  or <button
  onmousedown="event.preventDefault()" onClick="Module.insert(entree,'cfactor(')"><tt>cfactor(</tt>)</button>
  factors an expression (like <button
  onmousedown="event.preventDefault()" onClick="Module.insert(entree,'x^4-1')"><tt>x^4-1</tt></button>)
  over Q or Q[i].
    <br> <tt>simplify(sin(3x)/sin(x)); gcd(x^4-1,x^3-1) </tt>
  </li>
  <li> Solve equations :
    <tt> solve(x^2-3*x+2=0); csolve(x^2=2*i);
  solve([x+y=1,x-y=3],[x,y]) </tt>
  </li>
  <li>Calculus :
    <tt> f(x):=sin(x^2):; f(sqrt(pi)); f'(2); f'(y)
    <br> int(1/(x^4-1)); int(1/(x^4+1)^4,x,0,+infinity)
  <br> limit(sin(x)/x,x=0); series(sin(x),x=0,5);</tt>
  </li>
  <li> Linear algebra :
    <tt> A:=[[1,2],[3,4]]; inv(A); det(A-x*idn(A)); A[0,0]; rref(A);
  eigenvalues(A); eigenvectors(A);</tt>
  </li>
  <li> Plots :
  <tt>plot([sin(x),x-x^3/3!],x=-3..3,color=[red,blue])
  <br> plotfunc(x^2-y^2,[x=-2..2,y=-2..2]); plane(z=0,color=cyan+filled);
  </tt>
</ul>
<br>
Some features are disabled by default on mobile devices.
Note also that Chrome mobile (default
browser on Android devices) is much
slower than Firefox (about 5 times slower), it freezes about ten seconds during
the first evaluation. Moreover Chrome does not support mathml
natively, it requires Mathjax to display 2d formula, this requires
net access and works only if Xcas is installed on the device.
<br><b>It is highly recommended to download Firefox and run Xcas from Firefox.</b>
<br>
  If you want to <strong>install</strong> Xcas on your device, unzip
  <a href="http://www-fourier.ujf-grenoble.fr/~parisse/giac/xcashtml.zip">
  xcashtml.zip</a> and search
  <tt>xcasen.html</tt>, from
  <a href="file:///sdcard/">here</tt></a> (Android).
  <br>
<b>On mobile devices, the builtin keyboard delete key is incompatible
with the commandline, please use the del key above.</b><br>
<button
onclick="document.getElementById('help').style.display='none';">Hide tutorial</button>
</span>

<div>
<button style="height:25px"
  onclick="if(document.getElementById('help').style.display=='none')
  document.getElementById('help').style.display='block';
  else document.getElementById('help').style.display='none';"
title="Show or hide tutorial">Tuto</button>
<button style="height:25px"
  onclick="document.getElementById('manuels').style.display='block';"
title="Show or hide the list of manuals">Docs</button>
  <button style="width:45px;height:25px;vertical-align:top" onclick="UI.addhelp('?',document.getElementById('helptxt').value)">?</button>
  <textarea cols="12" style="height:25px;font-size:large" id="helptxt" rows=1 onclick="UI.focused=this;" onkeypress="if (event.keyCode!=13) return true;UI.addhelp('?',value); return false;"></textarea>
  <button style="width:45px;height:25px;vertical-align:top" onclick="helpoutput.innerHTML='';document.getElementById('helptxt').value='';document.getElementById('helptxt').focus();">Del</button>
</div>

<div id="divhelpoutput" style="max-height: 200px; overflow:auto">
<table id="helpoutput" title="Aide"
  style="max-width:1000px "></table>
</div>
<div id="history4" style="display:none">
  <h3>Variables</h3>
  <button style="height:25px"  name="add_purge"
  onmousedown="event.preventDefault()"
  onClick="UI.insert(UI.focused,'purge(')" title="Clear content of one or more variables, for example purge(a) or purge(a,b,c)">purge</button>
  <button style="height:25px" onclick="UI.addhelp(' ','VARS(1)')" title="Show list of variables/values">List</button>
  <button style="height:25px" onclick="UI.addhelp(' ','rm_all_vars(1)')" title="Erase content for all variables">Erase</button>
</div>
<hr>

<div id="history2" style="display:none">
  <h3>History</h3>
  <button style="height:25px" onclick="UI.exec(document.getElementById('mathoutput'),0)"
title="Evaluate all levels">Eval</button>
  <button style="height:25px" onclick="UI.show_answers(true)" title="Show answers">+</button>
  <button style="height:25px" onclick="UI.show_answers(false)" title="Hide answers">-</button>
  <button style="height:25px" onclick="UI.erase_all(document.getElementById('mathoutput'))"
title="Move all levels to trash">Clear</button>
  <br>
  <h3>Trash</h3>
  <button style="height:25px" onclick="UI.restoretrash()" title="Restore history levels from trash">Restore</button>
  <button style="height:25px" onclick="UI.emptytrash()" title="Empty trash">Empty</button>
</div>

<div id="divoutput" style="max-height: 400px; overflow:auto">
<table id="mathoutput" contextmenu="cmdmenu" title="History"
  style="max-width:1000px "  ></table>
</div>


<table border="0" align="center" summary="" id="keyboard"
  style="display:none" onmousedown="event.preventDefault()" >
  <tr>
    <td>
      <input type="button" style="width:30px;height:35px;"  name="add_newline" id="add_newline" value="\n" onmousedown="event.preventDefault()" onClick ="UI.insert(UI.focused,' \n')">
      <input type="button" style="width:30px;height:35px" name="add_'" id="add_'" value="'" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'\'')">
      <input type="button" style="width:30px;height:35px" name="add_,"
id="add_,"
  value="," onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,',')" title="Comma is a separator inside vectors">
      <input type="button" style="width:30px;height:35px" name="add_left_paren" id="add_left_paren" value="(" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'(')">
      <input type="button" style="width:30px;height:35px"
      name="add_right_paren" id="add_right_paren" value=")"
      onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,')')">
      <input type="button" style="width:30px;height:35px" name="add_i"
id="add_i"
  value="i" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'i')" title="Complex number square root of -1">
      <input type="button" style="width:30px;height:35px" name="add_7" id="add_7" value="7" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'7')">
      <input type="button" style="width:30px;height:35px" name="add_8" id="add_8" value="8" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'8')">
      <input type="button" style="width:30px;height:35px" name="add_9" id="add_9" value="9" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'9')">
      <input type="button" style="width:30px;height:35px" name="add_/"
id="add_/"
  value="/" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'/')" title="Division. Type // for a comment">
    </td>
  </tr>
  <tr>
    <td>
      <input type="button" style="width:30px;height:35px" name="add_x" id="add_x" value="x" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'x')" title="x">
      <input type="button" style="width:30px;height:35px" name="add_y"
id="add_y"
  value="y" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'y')" title="y">
      <input type="button" style="width:30px;height:35px"
      name="add_semi" id="add_semi" value=";" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,' ;')"
  title="Semicolumn must be used at the end of instructions inside programs or to evaluate several instructions once.">
      <input type="button" style="width:30px;height:35px"
  name="add_left_[" id="add_left_[" value="[]" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'[]');UI.moveCaret(UI.focused,-1);"
  title="[ is an open delimiter for vectors, lists and matrices, for example [1,2,3] or [[1,2],[3,4]]">
      <input type="button" style="width:29px;height:35px;"
  id="add_abs" value="|.|" onmousedown="event.preventDefault()"
  onClick="UI.insert(UI.focused,'abs(')" title="Absolute value">
      <input type="button" style="width:30px;height:35px" name="add_pi" id="add_pi" value="π" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'pi')">
      <input type="button" style="width:30px;height:35px" name="add_4" id="add_4" value="4" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'4')">
      <input type="button" style="width:30px;height:35px" name="add_5" id="add_5" value="5" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'5')">
      <input type="button" style="width:30px;height:35px" name="add_6" id="add_6" value="6" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'6')">
      <input type="button" style="width:30px;height:35px" name="add_*" id="add_*" value="*" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'*')">
    </td>
  </tr>
  <tr>
    <td>
      <input type="button" style="width:29px;height:35px;"
  id="add_beg"
  value="beg" onmousedown="event.preventDefault()"
  onClick="UI.setselbeg(UI.focused);" title="Selection begin">
      <input type="button" style="width:29px;height:35px;"
  id="add_end"
  value="end" onmousedown="event.preventDefault()"
  onClick="UI.setselend(UI.focused)" title="Selection end">
      <input type="button" style="width:30px;height:35px" name="add_:"
id="add_:"
  value=":" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,' :=')" title=":= is the affectation operator, for example a:=pi/2; sin(a)">
      <input type="button" style="width:30px;height:35px"
  name="add_left_{" id="add_left_{" value="{}" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'{}');UI.moveCaret(UI.focused,-1);"
  title="{ is an opening bloc delimiter in programs">
      <input type="button" style="width:30px;height:35px" name="add_!" id="add_!" value="!" onClick ="UI.insert(UI.focused,'!')">  
      <input type="button" style="width:30px;height:35px" name="add_∞" id="add_∞" value="∞" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'∞')" title="+∞. Note that infinity is unsigned complex infinity.">
      <input type="button" style="width:30px;height:35px" name="add_1" id="add_1" value="1" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'1')">  
      <input type="button" style="width:30px;height:35px" name="add_2" id="add_2" value="2" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'2')">  
      <input type="button" style="width:30px;height:35px" name="add_3" id="add_3" value="3" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'3')">  
      <input type="button" style="width:30px;height:35px" name="add_-" id="add_-" value="-" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'-')">  
    </td>
  </tr>
  <tr>
    <td>
      <input type="button" style="width:30px;height:35px" name="copy_button" id="copy_button" value="cp"
      onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,UI.selection)" title="Copy last selected commandline to focus.">  
      <input type="button" style="width:30px;height:35px;" name="curseur_up"
id="curseur_up"
  value="↑" onmousedown="event.preventDefault()"
  onClick="UI.moveCaretUpDown(UI.focused,-1)" title="caret up">
      <input type="button" style="width:30px;height:35px" name="add-=" id="add-=" value="=" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'=')">
      <input type="button" style="width:30px;height:35px" name="add__" id="add__" value="_" onClick ="UI.insert(UI.focused,'_')">  
      <input type="button" style="width:30px;height:35px" name="add_exp"
id="add_exp"
  value="e^" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'exp(')" title="Exponential function">   
      <input type="button" style="width:30px;height:35px" name="add_ln"
id="add_ln"
  value="ln" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'ln(')" title="Neperian logarithme (base e)">        
      <input type="button" style="width:30px;height:35px" name="add_e"
id="add_e"
  value="e" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'e')" title="e is either exponential basis or separator between mantissa and exponent in a floating point number">  
      <input type="button" style="width:30px;height:35px" name="add_0" id="add_0" value="0" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'0')">  
      <input type="button" style="width:30px;height:35px" name="add_." id="add_." value="." onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'.')">  
      <input type="button" style="width:30px;height:35px" name="add_+" id="add_+" value="+" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'+')">  
    </td>
  </tr>
  <tr>
    <td>
      <input type="button" style="width:29px;height:35px;"
  onmousedown="event.preventDefault()"
  onClick="UI.insert(UI.focused,'<');" id="add_inferieur" value="<"
  title="Insert <">
      <input type="button" style="width:30px;height:35px;" name="curseur_down"
id="curseur_down"
      value="↓" onmousedown="event.preventDefault()"
  onClick="UI.moveCaretUpDown(UI.focused,1)" title="caret down">
      <input type="button" style="width:29px;height:35px;"
  onmousedown="event.preventDefault()"
  onClick="UI.insert(UI.focused,'>');" id="add_superieur" value=">"
  title="Insert >">
      <input type="button" style="width:30px;height:35px;" name="add_a" id="add_a" value="a" onmousedown="event.preventDefault()" onClick ="UI.insert(UI.focused,'a')">
      <input type="button" style="width:30px;height:35px" name="add_sin"
id="add_sin"
  value="sin" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'sin(')" title="sine function, type asin for arcinus">        
      <input type="button" style="width:30px;height:35px" name="add_cos"
id="add_cos"
  value="cos" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'cos(')" title="cosine function, type acos for arccosinus">        
      <input type="button" style="width:30px;height:35px" name="add_tan"
id="add_tan"
  value="tan" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'tan(')" title="tangent function, type atan for arctangente">        
      <input type="button" style="width:29px;height:35px;" name="add_sq"
id="add_sq"
  value="^2" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'^2')" title="Square">
      <input type="button" style="width:30px;height:35px" name="add_sqrt"
id="add_sqrt"
  value="√" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'sqrt(')" title="square root">        
      <input type="button" style="width:30px;height:35px" name="add_^" id="add_^" value="^"  onmousedown="event.preventDefault()" onClick ="UI.insert(UI.focused,'^')">  
    </td>    
  </tr>
</table>

<table border="0" align="center" summary="" id="keyboardfunc"
  style="display:none" onmousedown="event.preventDefault()" >
  <tr>
    <td>
      <input type="button" style="width:60px;height:35px"
  name="add_simplify" id="add_simplify" value="simplify"
  onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'simplify(') ;UI.kbdonfuncoff();" title="Tries to simplify an expression, for example simplify(sin(3x)/sin(x)). On failure, try ratnormal, normal or a precise rewrite command.">
      <input type="button" style="width:60px;height:35px"
  name="add_normal" id="add_normal" value="normal"
  onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'normal(') ;UI.kbdonfuncoff();" title="normal expands an expression, for example normal((x+1)^6)">
      <input type="button" style="width:60px;height:35px"
  name="add_factor" id="add_factor" value="factor"
  onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'factor(') ;UI.kbdonfuncoff();" title="Factorization, for example factor(x^4-1). Run cfactor for factorization over C">
      <input type="button" style="width:60px;height:35px"
  name="add_partfrac" id="add_partfrac" value="partfrac"
      onmousedown="event.preventDefault()"
  onClick="UI.insert(UI.focused,'partfrac(') ;UI.kbdonfuncoff();" title="Partial fraction decomposition, e.g. partfrac(1/(x^4-1)). Use cpartfrac on C">
      <input type="button" style="width:60px;height:35px"
  name="add_tcollect" id="add_tcollect" value="tcollect"
  onmousedown="event.preventDefault()"
  onClick="UI.insert(UI.focused,'tcollect(') ;UI.kbdonfuncoff();"
  title="Linearize and regroup trigonometric expressions">
      <input type="button" style="width:60px;height:35px"
  name="add_texpand" id="add_texpand" value="texpand"
  onmousedown="event.preventDefault()"
  onClick="UI.insert(UI.focused,'texpand(') ;UI.kbdonfuncoff();"
  title="Expand trigonometric, exponential and log expressions">

    </td>
  </tr>
  <tr>
    <td>
      <input type="button" style="width:60px;height:35px" name="add_solve"
id="add_solve"
  value="solve" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'solve(') ;UI.kbdonfuncoff();"
  title="Solve equation or expression=0 wrt 1 or more variables, for example solve(x^4-1=0) or solve(y^3-1,y) or solve([x^2-y^2=1,x+y=3],[x,y]). Run csolve for solving over C.">       <input type="button" style="width:60px;height:35px" name="add_csolve"
id="add_csolve"
  value="csolve" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'csolve(') ;UI.kbdonfuncoff();"
  title="Solve over C equation or expression=0 wrt 1 or more variables, for example csolve(x^4-1=0) or csolve(y^3-1,y) or csolve([x^2-y^2=1,x+y=3],[x,y]). Run solve for solving over R.">
      <input type="button" style="width:60px;height:35px" name="add_linsolve"
id="add_linsolve"
  value="linsolve" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'linsolve(') ;UI.kbdonfuncoff();"
  title="solve a linear system, for example linsolve([x+y=1,a*x-y=2],[x,y])">
      <input type="button" style="width:60px;height:35px"
  name="add_fsolve" id="add_fsolve" value="fsolve"
  onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'fsolve(') ;UI.kbdonfuncoff();" title="fsolve solves numerically an equation or system, for example fsolve(cos(x)=x,x=0..5) or fsolve(cos(x),x=0.0)">
      <input type="button" style="width:60px;height:35px"
  name="add_desolve" id="add_desolve" value="desolve"
  onmousedown="event.preventDefault()"
  onClick="UI.insert(UI.focused,'desolve(') ;UI.kbdonfuncoff();" title="Solve differential
      equation, for example desolve(y''+y=0), desolve(y'+y=0,y(0)=1)">
      <input type="button" style="width:45px;height:35px"
  name="add_rsolve" id="add_rsolve" value="rsolve"
  onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'rsolve(') ;UI.kbdonfuncoff();" title="Solve a recurrence relation, for example rsolve(u(n+2)=u(n+1)+u(n),u(n),[u(0)=1,u(1)=1])">
    </td>
  </tr>
  <tr>
    <td>
      <input type="button" style="width:30px;height:35px" name="add_sum"
id="add_sum"
  value="∑" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'sum(') ;UI.kbdonfuncoff();" title="Sum of an expression for a variable between two boundaries, for example ∑(k,k,1,n) or ∑(1/n^2,n,1,inf)">
      <input type="button" style="width:30px;height:35px" name="add_diff"
id="add_diff"
  value="∂" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'diff(') ;UI.kbdonfuncoff();" title="Derivative of an expression. For a function f, for example f(x):=sin(x^2), the derivative of f is f', for example g:=f' or f'(2)">        
      <input type="button" style="width:30px;height:35px"
  name="add_integrate" id="add_integrate" value="∫" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'int(') ;UI.kbdonfuncoff();"
  title="Integral computation, for example ∫(x^2*sin(x)*exp(x),x) or ∫(1/(x^4+1),x,0,inf)">
      <input type="button" style="width:60px;height:35px" name="add_limit"
id="add_limit"
  value="limit" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'limit(') ;UI.kbdonfuncoff();" title="limit of an expression if a variable tends to a limit point, for example limit(sin(x)/x,x,0). With an optional 4th parameter equal to 1 or -1 returns a right or left limit.">
      <input type="button" style="width:60px;height:35px"
  name="add_series" id="add_series" value="series"
  onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'series(') ;UI.kbdonfuncoff();" title="series computes the Taylor expansion of an expression as a variable tends to a limit-point, for example series(sin(x),x=0,5,polynom). Without polynom, a remainder term is returned. For unidirectional expansion, add 1 or -1 before polynom">
         <input type="button" style="width:30px;height:35px" name="add_seq"
id="add_seq"
  value="seq" onmousedown="event.preventDefault()"
  onClick="UI.insert(UI.focused,'seq(')" title="Create sequence, for example seq(j^2,j,1,n) create the sequence of square from 1 to n">        
    </td>
  </tr>
  <tr>
    <td>
      <input type="button" style="width:60px;height:35px" name="add_tabvar"
id="add_tabvar"
  value="tabvar" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'tabvar(,plot)');UI.moveCaret(UI.focused,-6);UI.kbdonfuncoff();"
  title="Function or parametric plot study, for example tabvar(sin(x)) ou tabvar([cos(2t),sin(3t)])">
      <input type="button" style="width:60px;height:35px" name="add_plot"
id="add_plot"
  value="plotfunc" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'plotfunc(') ;UI.kbdonfuncoff();"
  title="Graphe of an expression, for example plotfunc(sin(x),x=-5..5,xstep=0.1)">
      <input type="button" style="width:60px;height:35px"
  name="add_plotparam" id="add_plotparam" value="param"
  onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'plotparam(') ;UI.kbdonfuncoff();" title="Parametric plot, for exemple plotparam([cos(t),sin(t)],t=0..2*pi,tstep=0.1)">
      <input type="button" style="width:60px;height:35px"
  name="add_plotpolar" id="add_plotpolar" value="polar"
  onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'plotpolar(') ;UI.kbdonfuncoff();" title="Polar plot, for example plotpolar(exp(r),r=-3..3)">
      <input type="button" style="width:60px;height:35px"
  name="add_plotimplicit" id="add_plotimplicit" value="implicit"
  onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'plotimplicit(') ;UI.kbdonfuncoff();" title="Implicit plot, for example plotimplicit(x^2+x*y+y^2=3)">
      <input type="button" id="add_curseur" style="height:35px" onclick="UI.addcurseur(String.fromCharCode(UI.paramname),0,-5,5,0.1); UI.paramname++;" title="Add a slider" value="Slider">
    </td>
  </tr>
  <tr>
    <td>
        <input type="button" style="width:30px;height:35px" name="add_//"
id="add_//"
  value="//" onmousedown="event.preventDefault()" onClick="UI.insert(UI.focused,'//')" title="comment">        
      <input type="button" style="width:29px;height:35px" name="add_space"
id="add_space"
  value=" " onmousedown="event.preventDefault()"
  onClick="UI.insert(UI.focused,' ')" title="Add space">        
      <input type="button" style="width:29px;height:35px" id="add_nlprog"
      value="\n" onmousedown="event.preventDefault()"
      onClick="UI.insert(UI.focused,'\n')" title="Add newline">        
      <input type="button" style="width:29px;height:35px" 
      id="add_indent"
      value="->/" onmousedown="event.preventDefault()"
      onClick="UI.indentline(UI.focused);" title="Indent current line">
      <input type="button" style="width:45px;height:35px" name="add_test"
id="add_test"
  value="if" onmousedown="event.preventDefault()"
  onClick="UI.insert(UI.focused,'\nif  then  else  end;');UI.moveCaret(UI.focused,-17); " title="Test">
      <input type="button" style="width:45px;height:35px" name="add_pour"
id="add_pour"
  value="for" onmousedown="event.preventDefault()"
  onClick="UI.insert(UI.focused,'\nfor  from  to  do\n\nod;');UI.indentline(UI.focused);UI.moveCaretUpDown(UI.focused,-1);UI.indentline(UI.focused);UI.moveCaretUpDown(UI.focused,-1);UI.moveCaret(UI.focused,2);UI.indentline(UI.focused);UI.kbdonfuncoff();" title="Loop">         <input type="button" style="width:45px;height:35px" name="add_tantque"
id="add_tantque"
  value="while" onmousedown="event.preventDefault()"
  onClick="UI.insert(UI.focused,'\nwhile  do\n\nend;');UI.indentline(UI.focused);UI.moveCaretUpDown(UI.focused,-1);UI.indentline(UI.focused);UI.moveCaretUpDown(UI.focused,-1);UI.indentline(UI.focused);UI.moveCaret(UI.focused,4)" title="Loop">
      <input type="button" id="add_function" style="height:35px" value="function" onclick="if(document.getElementById('assistant_prog').style.display=='none'){
      document.getElementById('assistant_prog').style.display='block';
     }
     else {
      document.getElementById('assistant_prog').style.display='none';
     }"
  title="Function assistant">
      <input type="button" style="width:46px;height:35px" name="add_debug"
id="add_debug"
  value="debug" onmousedown="event.preventDefault()"
  onClick="UI.insert(UI.focused,'debug(')" title="Debugger command">
    </td>
  </tr>
</table>
<div id="assistant_prog" style="display:none">
  <b>New function</b><br>
  function name <textarea id="funcname" rows=1>f</textarea><br>
  list of arguments <textarea id="argsname" rows=1>x,y</textarea><br>
  local variables <textarea id="localvars" rows=1>z</textarea><br>
  returned value <textarea id="returnedvar" rows=1>z</textarea><br>
  <button style="height:25px" onclick="UI.insert(UI.focused,'function '+document.getElementById('funcname').value+'('+document.getElementById('argsname').value+'){\n  var '+document.getElementById('localvars').value+';\n  \n  return '+document.getElementById('returnedvar').value+';\n}:;\n');UI.moveCaretUpDown(UI.focused,-3);UI.moveCaret(UI.focused,2);document.getElementById('assistant_prog').style.display='none';">Create</button> <button style="height:25px" onclick="document.getElementById('assistant_prog').style.display='none'">Cancel</button>
</div>


<div contextmenu="cmdmenu" title="F1: help on keyword before caret. Right-click (Firefox): commands menu" >
<button id="button_ok" onclick="if (UI.focused==cmentree) UI.eval_cmdline(); else {UI.reeval(UI.focused,'');}" style="color:green;width:35px;height:35px" title="Eval commandline">
  <strong>ok</strong></button>
  <button id="button_gauche" style="width:32px;height:35px"
  onmousedown="event.preventDefault()" onClick="UI.move_caret_or_focus(UI.focused,-1)"  title="Move caret to the left"> ← </button>
  <button id="button_droit" style="width:32px;height:35px" onmousedown="event.preventDefault()" onClick="UI.move_caret_or_focus(UI.focused,1)" title="Move caret to the right"> → </button>
  <button id="button_cmd" style="width:37px;height:35px" onmousedown="event.preventDefault()" onclick="document.getElementById('keyboardfunc').style.display='none'; document.getElementById('keyboard').style.display='none'; UI.focused=cmentree;cmentree.focus(); UI.resizetextarea(cmentree);//if (UI.prettyprint && UI.usemathjax && UI.histcount>0) MathJax.Hub.Queue(["Typeset",MathJax.Hub]);"
  title="Focus on commandline">cmd</button>
  <button id="select_button" style="width:32px;height:35px" name="select_button" onmousedown="event.preventDefault()" onClick="if (UI.focusaftereval) UI.focused.focus(); if (UI.focused.type!='textarea'){UI.focused.execCommand('selectAll'); } else {UI.focused.select(); UI.selection=UI.focused.value;}" title="Select commandline"> sel</button>
  <button id="button_del" style="width:30px;height:35px" onmousedown="event.preventDefault()" onclick="UI.backspace(UI.focused)" title="Erase 1 char">del</button>
  <button id="button_help" style="width:35px;height:35px" onmousedown="event.preventDefault()" onClick="UI.completion(cmentree)" title="Short online help and examples for a command, or completion suggestions">?</button>
  <button id="button_123" style="width:37px;height:35px" onmousedown="event.preventDefault()"
  onclick="if (document.getElementById('keyboard').style.display=='inline') document.getElementById('keyboard').style.display='none'; else { document.getElementById('keyboard').style.display='inline'; document.getElementById('keyboardfunc').style.display='none';} if (UI.focusaftereval){ UI.focused.focus(); UI.focused.blur();}"
title="Show or hide scientific keyboard">123</button>
<button id="button_util" style="width:37px;height:35px" onmousedown="event.preventDefault()"
onclick="UI.show_menu();"
title="Show or hide frequently used commands">menu</button>
&nbsp;
<button style="height:35px" id="stop_button" style="height:35px;visibility:hidden" onclick="if (UI.webworker && confirm('Really kill current session ?')){ UI.webworker.terminate(); UI.busy=0; UI.webworker=0;alert('Session restarted. Everything has been cleared.');}" title="End current session">STOP</button>

<br>

<textarea name="entree" id="entree"  style="font-size:18px;width:98%" rows=1
  onkeypress="UI.focused=this;if (event.keyCode!=13 || event.shiftKey) return true;UI.eval_cmdline1(value,true); return false;" ></textarea>
</div>

<hr>
<strong>Console</strong>
<button style="height:25px" title="Clear console" onclick="var field=document.getElementById('output');field.innerHTML=''">Clear</button>
<button style="height:25px" title="Increase line number" onclick="var field=document.getElementById('output');var s=field.style.maxHeight; s=s.substr(0,s.length-2);s=eval(s)+20 ;s=s+'px';field.style.maxHeight =s ;">+</button>
<button style="height:25px" title="Decrease line number" onclick="var field=document.getElementById('output');var s=field.style.maxHeight; s=s.substr(0,s.length-2);s=Math.max(eval(s)-20,40) ;s=s+'px';field.style.maxHeight =s ;">-</button>
<div id="output" style="max-height: 200px; overflow:auto"></div>
<hr>


<table border="0" align="left" summary="">
  <tr>
    <tr>
      <td><button id="boutons_3d0" style="height:25px;display:none" onclick="
	if(document.getElementById('boutons_3d').style.display=='none'){
	document.getElementById('boutons_3d').style.display='inherit';
	document.getElementById('canvas').style.display='inherit';
	}
	else {
	document.getElementById('boutons_3d').style.display='none';
	document.getElementById('canvas').style.display='none';
	}"
	title="Show or hide 3d graph">3d Graph</button>
	<span id="boutons_3d" style="display:none">
	<button style="height:25px" onclick="UI.giac_renderer('-')">out</button>
	<button style="height:25px" onclick="UI.giac_renderer('+')">in</button>
	<button style="height:25px" onclick="UI.giac_renderer('l')"> ← </button>
	<button style="height:25px" onclick="UI.giac_renderer('r')"> → </button>
	<button style="height:25px" onclick="UI.giac_renderer('u')"> ↑ </button>
	<button style="height:25px" onclick="UI.giac_renderer('d')"> ↓ </button>
	</span>
      </td>
    </tr>
    <tr>
    <td>
      <canvas id='canvas' width=0 height=0
  onmousedown="UI.canvas_pushed=true;UI.canvas_lastx=event.clientX; UI.canvas_lasty=event.clientY;"
  onmouseup="UI.canvas_pushed=false;"
   >
      </canvas>
    </td>
  </tr>
</table>


<div class="emscripten" id="status">Downloading...</div>
<div class="emscripten">
  <progress value="0" max="100" id="progress" hidden=1></progress>
</div>


<script src="w3data.js"></script>
<div w3-include-html="menuen.js"></div>

<script src="FileSaver.js"></script>

<script src="codemirror.js"></script>
<link rel="stylesheet" href="codemirror.css">
<link rel="stylesheet" href="show-hint.css">
<script src="xcasmode.js"></script>
<script src="matchbrackets.js"></script>
<script src="show-hint.js"></script>
  <style type="text/css">
  .CodeMirror {border: 1px solid black; height:auto;}
  dt {font-family: monospace; color: #666;}
  </style>

  <script type='text/javascript'>
  var UI ={
  focusaftereval:true,
  docprefix:"http://www-fourier.ujf-grenoble.fr/%7eparisse/giac/doc/en/cascmd_en/",
  base_url:"http://www-fourier.ujf-grenoble.fr/%7eparisse/",
  usemathjax:false,
  prettyprint:true,
  qa:false,
  focused:entree,
  usecm:true,
  histcount:0,
  selection:'',
  langue:-1,
  canvas_lastx:0,
  canvas_lasty:0,
  canvas_pushed:false,
  initconfigstring:'',
  sleep:function(miliseconds) {
     var currentTime = new Date().getTime();
     while (currentTime + miliseconds >= new Date().getTime()) {
     }
  },
  is_touch_device() {
   return (('ontouchstart' in window)
      || (navigator.MaxTouchPoints > 0)
      || (navigator.msMaxTouchPoints > 0));
  },
  switchcm:function(){
  if (UI.usecm){
    if (cmentree==entree){
     // cmentree may be released with cmentree.toTextArea();
     cmentree=CodeMirror.fromTextArea(entree,{
      matchBrackets: true,
      lineNumbers: true,
      viewportMargin: Infinity
     });
     //console.log(entree.type);
     //cmentree.setSize(window.innerWidth-20,40);
     cmentree.on("focus",function(cm){ UI.set_focused(cm); });
     cmentree.on("blur",function(cm) { if (cm.getSelection().length > 0){UI.selection=cm.getSelection();} });
     cmentree.setValue(entree.value);
     UI.changefontsize(cmentree,18);
     cmentree.setOption("extraKeys", {
      Enter: function(cm){
      UI.eval_cmdline();
     },
     F1: function(cm) {
      UI.completion(cm);
     },
     Tab: function(cm) {
      UI.completion(cm);
     },
    });
   } // if (UI.usecm)
  } else { if (cmentree!=entree) cmentree.toTextArea(); cmentree=entree; }
   cmentree.focus();
 },
  kbdonfuncoff:function() {
    document.getElementById('keyboard').style.display='inline';
    document.getElementById('keyboardfunc').style.display='none';
  },
  restorefrom:function(c){
    var s=UI.readCookie(c);
    //console.log(s);
    UI.restoresession(s,document.getElementById('mathoutput'),true,false);
    document.getElementById('loadfile_cookie').innerHTML='';
  },
  listCookies:function() { // list cookies with name begin == ' xcas__'
    var theCookies = document.cookie.split(';');
    var aString = '';
    for (var i = 0 ; i < theCookies.length; i++) {
        // console.log(i,theCookies[i].substr(0,7));
        var tmp=theCookies[i];
        var pos=tmp.search('=');
        if (pos>7 && tmp.substr(0,7)==' xcas__' ){
          var tmpname=tmp.substr(7,pos-7);
          aString += "<button onclick=\"UI.restorefrom('"+tmp.substr(1,pos-1)+"')\">"+tmpname+"</button>\n";
        }
    }
    aString += "<button onclick=document.getElementById('loadfile_cookie').innerHTML=''>cancel</button>\n"
    //console.log(aString);
    return aString;
  },
  createCookie:function(name,value,days) {
	if (days) {
	  var date = new Date();
	  date.setTime(date.getTime()+(days*24*60*60*1000));
	  var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
  },
  readCookie:function(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
          var c = ca[i];
	  while (c.charAt(0)==' ') c = c.substring(1,c.length);
	  if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
  },
  eraseCookie:function(name) {
	createCookie(name,"",-1);
  },
  detectmob:function() {
 if( navigator.userAgent.match(/Android/i)
 || navigator.userAgent.match(/webOS/i)
 || navigator.userAgent.match(/iPhone/i)
 || navigator.userAgent.match(/iPad/i)
 || navigator.userAgent.match(/iPod/i)
 || navigator.userAgent.match(/BlackBerry/i)
 || navigator.userAgent.match(/Windows Phone/i)
 ) return true;
 else
    return false;
},
  browser_type: function(){
   var isOpera = !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;
   var isFirefox = typeof InstallTrigger !== 'undefined';   // Firefox 1.0+
   var isSafari = Object.prototype.toString.call(window.HTMLElement).indexOf('Constructor') > 0;
   var isChrome = !!window.chrome && !isOpera;              // Chrome 1+
   var isIE = /*@cc_on!@*/false || !!document.documentMode; // At least IE6
   if (isFirefox) return 1;
   if (isSafari) return 2;
   if (isChrome) return 3;
   if (isIE) return 4;
   if (isOpera) return 5;
   return 0;
  },
  lowercase1: function(text){
   var value=text;
   if (value.length && value.charCodeAt(0)>64 && value.charCodeAt(0)<90)
     value = value.substr(0,1).toLowerCase()+value.substr(1,value.length-1);
   return value;
  },
  caseval: function(text){
   var docaseval = Module.cwrap('caseval',  'string', ['string']);
   var value=text;
   value=value.replace(/%22/g,'\"');
   var n=value.search(';');
   if (n<0 || n>=value.length)
     value='add_autosimplify('+value+')';
     var s,err;
     try {s=docaseval(value); } catch(err){ }
      // Module.print(text+ ' '+s);
      return s;
  },
  webworker:0,
  withworker:0,
  busy:0,
  casevalcb: function(text,callback,args){
   // prepare for webworker: casevalcb will run docaseval in a worker
   // too slow to be useful, and plotting does not work...
   if (UI.withworker && !!window.Worker) {
     if (!UI.webworker){
      UI.webworker = new Worker("giacworker.js");
      console.log('worker created ');
     }
     // the worker will do the evaluation and post s
     UI.webworker.onmessage =  function(e){
       var s=e.data[1]; UI.busy=0;
       if (e.data[0]=='cas') callback(s,args);
       if (e.data[0]=='print') Module.print(s);
     }
     UI.busy=1;
     UI.webworker.postMessage(['eval',text]);
     return;
     // STOP: myWorker.terminate()
   }
   var docaseval = Module.cwrap('caseval',  'string', ['string']);
   var value=text;
   var n=value.search(';');
   if (n<0 || n>=value.length)
     value='add_autosimplify('+value+')';
   var s,err;
   try {s=docaseval(value); } catch(err){ }
   // Module.print(text+ ' '+s);
   callback(s,args);
  },
  ckenter: function(event,field){
    var key = event.keyCode;
    if (key != 13 || event.shiftKey) return true;
    UI.reeval(field,'');
    return false;
  },
restoresession: function(chaine,hist,asked,doexec){
 var hashParams=chaine.split('&');
 if (hashParams.length==0) return;
 for(var i = 0; i < hashParams.length; i++){
    var s = hashParams[i];
    if (s.length)  document.getElementById('startup_restore').style.display='none';
    s=decodeURIComponent(s); //console.log(s);
    s=s.replace(/%3b/g,';');
    if (s.length && s.charAt(0)=='+'){
       if (!asked) doexec=true;
       s=s.substr(1);
       if (s.length) UI.eval_cmdline1(s,false);
       continue;
    }
    if (s.length && s.charAt(0)=='*'){
       if (!asked) doexec=true;
       var pos=s.search(',');
       var name=s.substr(1,pos-1);
       // Module.print(name);
       s=s.substr(pos+1,s.length-pos-1);
       pos=s.search(',');
       var value=s.substr(0,pos);
       // Module.print(value);
       s=s.substr(pos+1,s.length-pos-1);
       pos=s.search(',');
       var mini=s.substr(0,pos);
       // Module.print(mini);
       s=s.substr(pos+1,s.length-pos-1);
       pos=s.search(',');
       var maxi=s.substr(0,pos);
       // Module.print(maxi);
       s=s.substr(pos+1,s.length-pos-1);
       UI.addcurseur(name,value,mini,maxi,s);
       continue;
    }
    var p = s.split('=');
    if (p[0]=='') continue;
    if (p[0]=='entree' || p[0]=='cmentree'){
      cmentree.setValue( decodeURIComponent(p[1]));
      continue;
    }
    if (p[0]=='codemirror'){
      if (p[1]=='0') { document.getElementById('config').usecm.checked=false;  UI.set_config();}
      if (p[1]=='1') { document.getElementById('config').usecm.checked=true;  UI.set_config();}
      continue;
    }
    document.getElementById(p[0]).value = decodeURIComponent(p[1]);
  } // end for (i=...)
 if (doexec) UI.exec(hist,0);
 },
  link: function(start){
   var s=UI.makelink(start);
   UI.createCookie('xcas_session',s,365);
   if (s.length>0){
     s = UI.base_url+"xcasen.html#"+s;
     //Module.print(s);
     document.getElementById('thelink').innerHTML='<a href="'+s+'" target="_blank">Clone</a>';
     document.getElementById('themailto').innerHTML='<a href="mailto:?subject=Xcas session&body=Hello%0d%0aPlease follow this link: '+UI.rewritestring(s)+'">Mail to</a>';
   }
  },
  rewritestring: function(s){
    var res,i,l;
    l=s.length; res='';
    for (i=0;i<l;++i){
      if (s[i]=='&'){ res += "%26"; continue; }
      if (s[i]=='#'){ res += "%23"; continue; }
      res += s[i];
    }
    return res;
  },
  makelink: function(start){
    var s='';
    var cur=document.getElementById('mathoutput').firstChild;
    var i=0;
    for (;cur;i++){
     if (i>=start){
       var field=cur.firstChild;
       field=field.firstChild;
       field=UI.skip_buttons(field);
       var fs=field.innerHTML;
       if (fs.length>5){
         var fs1=fs.substr(0,5);
         if (fs1=="<form") {
          //Module.print(fs);
          var pos1=fs.search("<input");
          fs=fs.substr(pos1,fs.length-pos1);
          var pos1=fs.search("value=");
          pos1 += 7;
          fs=fs.substr(pos1,fs.length-pos1);
          var pos2=fs.search("\"");
          fs1=fs.substr(0,pos2); // cursor name
          var pos1=fs.search("value=");
          pos1 += 7;
          fs=fs.substr(pos1,fs.length-pos1);
          var pos2=fs.search("\"");
          fs1 += ','+fs.substr(0,pos2); // current value
          var pos1=fs.search("value=");
          pos1 += 7;
          fs=fs.substr(pos1,fs.length-pos1);
          var pos1=fs.search("value=");
          pos1 += 7;
          fs=fs.substr(pos1,fs.length-pos1);
          var pos2=fs.search("\"");
          fs1 += ','+fs.substr(0,pos2); // min
          var pos1=fs.search("value=");
          pos1 += 7;
          fs=fs.substr(pos1,fs.length-pos1);
          var pos1=fs.search("value=");
          pos1 += 7;
          fs=fs.substr(pos1,fs.length-pos1);
          var pos1=fs.search("value=");
          pos1 += 7;
          fs=fs.substr(pos1,fs.length-pos1);
          var pos2=fs.search("\"");
          fs1 += ','+fs.substr(0,pos2); //max
          var pos1=fs.search("value=");
          pos1 += 7;
          fs=fs.substr(pos1,fs.length-pos1);
          var pos2=fs.search("\"");
          fs1 += ','+fs.substr(0,pos2); // step
          s += '*' + fs1 +'&';
          cur=cur.nextSibling;
          continue;
         }
       }
       var pos=fs.search("<textarea");
       if (pos>=0 && pos<fs.length){
         // var tmp=field.firstChild.value.replace(/\n/g,'%0a'); tmp=tmp.replace(';','%3b','g');
         // s += '+' + tmp.replace('&&',' and ','g') + '&';
         var tmp=encodeURIComponent(field.firstChild.value);
         s += '+' + tmp + '&';
         cur=cur.nextSibling;
         continue;
       }
       pos = fs.search("UI.addhelp");
       if (pos>=0 && pos<fs.length){ cur=cur.nextSibling; continue;}
       s += '+//'+fs+'&';
     }
     cur=cur.nextSibling;
   }
   s=s.replace(/\"/g,'%22');
   return s;
  },
  canvas_mousemove:function(event,no){
    if (UI.canvas_pushed){
      // Module.print(event.clientX);
      if (UI.canvas_lastx!=event.clientX){
        if (event.clientX>UI.canvas_lastx)
          UI.giac_renderer('r'+no);
        else
          UI.giac_renderer('l'+no);
        UI.canvas_lastx=event.clientX;
      }
      if (UI.canvas_lasty!=event.clientY){
        if (event.clientY>UI.canvas_lasty)
          UI.giac_renderer('d'+no);
        else
          UI.giac_renderer('u'+no);
        UI.canvas_lasty=event.clientY;
      }
    }
  },
show_menu:function(){
 if (document.getElementById('keyboardfunc').style.display=='inline')
   document.getElementById('keyboardfunc').style.display='none';
 else {
  document.getElementById('keyboardfunc').style.display='inline';
  document.getElementById('keyboard').style.display='none';
 }
 if (UI.focusaftereval){ UI.focused.focus(); }
},
  show_config:function(){
    var form=document.getElementById('config');
    form.style.display='inline';
  },
  set_config_width:function(){
   var form=document.getElementById('config');
   var hw=window.innerWidth,hh=window.innerHeight;
   if (hw>=1000){ hw=hw-50; UI.focusaftereval=true;}
   if (hw<=500){ UI.focusaftereval=false; document.getElementById('exportbutton').style.display='none';}
   form.history_width.value=hw;
   form.outdiv_width.value=Math.floor(hw/2);
   document.getElementById('mathoutput').style.maxWidth=hw;
   document.getElementById('divoutput').style.maxHeight=form.history_height.value;
   var w=form.outdiv_width.value,h;
   if (w>hw-300) w=hw-300;
   var hi=hw-w-200;
   if (!UI.qa){ hi=hw-130; w=hi; }
   s='h1,h2,h3 { display:inline; }\ninput[type="number"] { width:40px;}\n .outdiv { width:'+w+'px; max-height: '+form.outdiv_height.value+'px;  overflow: auto;}\n.filenamecss {width:120px;height:20px}\n.historyinput {width:'+hi+'px;}';
   var st=document.getElementById('document_style');
   st.innerHTML=s;
var kbd_l=["add_newline","add_'","add_,","add_left_paren",
"add_right_paren" ,"add_i","add_7" ,"add_8" ,"add_9" ,"add_/",
"add_x" ,"add_y","add_semi" ,"add_left_[" ,"add_abs" ,"add_pi" ,
"add_4" ,"add_5" ,"add_6" ,"add_*" ,"add_beg","add_end","add_:",
"add_left_{" ,"add_!" ,"add_∞","add_1" ,"add_2" ,
"add_3" ,"add_-" ,"copy_button" ,"curseur_up","add-=" ,"add__" ,
"add_exp","add_ln","add_e","add_0" ,"add_." ,
"add_+" , "add_inferieur","curseur_down" ,"add_superieur","add_a" ,"add_sin" ,"add_cos",
"add_tan","add_sq","add_sqrt","add_^"];
var kbd_cmd=["button_ok","button_help","button_123","button_util","button_cmd",
"button_gauche","button_droit","select_button","button_del",
"add_//","add_space","add_nlprog","add_indent","add_test",
"add_pour","add_tantque","add_function","add_debug"];
var kbd_util=["add_simplify" ,"add_normal",
"add_factor" ,"add_partfrac","add_texpand","add_tcollect","add_solve","add_csolve",
"add_linsolve","add_fsolve" ,"add_desolve" ,"add_rsolve" ,"add_sum","add_diff",
"add_integrate" ,"add_limit","add_series" ,"add_seq","add_tabvar","add_plot",
"add_plotparam" ,"add_plotpolar","add_plotimplicit","add_curseur"];
  w=Math.floor(hw/12)+"px";
   h=Math.floor(hh/20)+"px"; console.log(hw,w,hh,h);
   w=Math.floor(hw/12); w=w+"px";
   h=Math.floor(hh/20); if (h<30) h=30; h=h+"px"; // console.log(hw,w,hh,h);
   for (var i=0;i<kbd_l.length;i++){
     document.getElementById(kbd_l[i]).style.width=w;
     document.getElementById(kbd_l[i]).style.height=h;
   }
   w=Math.floor(hw/11); if (w<34) w=34; w=w+"px";
   h=Math.floor(hh/20); if (h<35) h=35; h=h+"px"; // console.log(hw,w,hh,h);
   for (var i=0;i<kbd_cmd.length;i++){
     document.getElementById(kbd_cmd[i]).style.width=w;
     document.getElementById(kbd_cmd[i]).style.height=h;
   }
   w=Math.floor(hw/8); if (w<34) w=34; w=w+"px";
   h=Math.floor(hh/20); if (h<35) h=35; h=h+"px"; // console.log(hw,w,hh,h);
   for (var i=0;i<kbd_util.length;i++){
     document.getElementById(kbd_util[i]).style.width=w;
     document.getElementById(kbd_util[i]).style.height=h;
   }
  },
  config_string:function(){
   var form=document.getElementById('config');
   if (form.qa.checked) UI.qa=true; else UI.qa=false;
   if (form.usecm.checked) UI.usecm=true; else UI.usecm=false; UI.switchcm();
   UI.set_config_width();
   var s;
   if (form.online_doc.checked)
     UI.docprefix=UI.base_url+'giac/doc/en/cascmd_en/';
   else
     UI.docprefix="file://"+form.doc_path.value;
   if (form.prettyprint.checked) UI.prettyprint=true; else UI.prettyprint=false;
   if (form.worker_mode.checked){
     if (!UI.withworker) alert('Session restarted (variables cleared). Computations will be done by a webworker.')
     UI.withworker=true;
   } else {
     if (UI.withworker) alert('Session restarted (variables cleared).')
     UI.withworker=false;
   }
   if (UI.withworker) document.getElementById('stop_button').style.visibility='visible'; else document.getElementById('stop_button').style.visibility='hidden';
   UI.caseval("autosimplify("+form.autosimp_level.value+")");
   //Module.print(st.innerHTML);
   s='Digits:=';
   s += form.digits_mode.value;
   s += ';angle_radian:=';
   if (form.angle_mode.checked) s += 1; else s += 0;
   s += ';complex_mode:=';
   if (form.complex_mode.checked) s += 1; else s += 0;
   s += ';with_sqrt(';
   if (form.sqrt_mode.checked) s += 1; else s += 0;
   s += ');step_infolevel(';
   if (form.step_mode.checked) s += 1; else s += 0;
   s += ');';
   return s;
  },
  set_config:function(){
   var form=document.getElementById('config');
   var s=UI.config_string();
   console.log(s);
   UI.addhelp(' ',s);
   document.getElementById('config').style.display='none';
   if (UI.focusaftereval) UI.focused.focus();
   UI.createCookie('xcas_digits',form.digits_mode.value,10000);
   UI.createCookie('xcas_angle_radian',form.angle_mode.checked?1:-1,10000);
   UI.createCookie('xcas_complex_mode',form.complex_mode.checked?1:-1,10000);
   UI.createCookie('xcas_with_sqrt',form.sqrt_mode.checked?1:-1,10000);
   UI.createCookie('xcas_step_infolevel',form.step_mode.checked?1:-1,10000);
   UI.createCookie('xcas_autosimplify',form.autosimp_level.value,10000);
   UI.createCookie('xcas_docprefix',UI.docprefix,10000);
   UI.createCookie('xcas_withworker',UI.withworker?1:-1,10000);
   UI.createCookie('xcas_prettyprint',UI.prettyprint?1:-1,10000);
   UI.createCookie('xcas_qa',UI.qa?1:-1,10000);
   UI.createCookie('xcas_usecm',UI.usecm?1:-1,10000);
   UI.createCookie('xcas_history_width',form.history_width.value,10000);
   UI.createCookie('xcas_history_height',form.history_height.value,10000);
   UI.createCookie('xcas_outdiv_width',form.outdiv_width.value,10000);
   UI.createCookie('xcas_outdiv_height',form.outdiv_height.value,10000);
  },
  savesession:function(i){
    var s;
    filename=document.getElementById("outputfilename").value;
    if (i==2) {
      UI.createCookie('xcas__'+filename,UI.makelink(0),9999);
      console.log(UI.listCookies());
      return;
    }
    if (i==1){
      s=document.getElementById("fulldocument").innerHTML;
      s='<html id="fulldocument" manifest="xcas.appcache">'+s+'</html>';
    }
    else {
      s=document.getElementById("mathoutput").innerHTML;
    }
    var blob = new Blob([s], {type: "text/plain;charset=utf-8"});
    if (i==1) filename += ".html"; else filename += ".xw";
    saveAs(blob,filename);
  },
  show_history123:function(){
    document.getElementById('history1').style.visibility='visible';
    document.getElementById('history2').style.display='block';
    document.getElementById('history4').style.display='block';
    document.getElementById('startup').style.display='none';
    document.getElementById('startup1').style.display='none';
  },
  loadfile:function(oFiles){
    var nFiles = oFiles.length;
    for (var nFileId = 0; nFileId < nFiles; nFileId++) {
      // Module.print(oFiles[nFileId].name);
      var reader = new FileReader();
      reader.readAsText(oFiles[nFileId]);
      var s;
      reader.onloadend = function(e){
	s = e.target.result;
        if (s.length>7 && s.substr(0,7)=='<tbody>'){
         UI.show_history123();
         document.getElementById("mathoutput").innerHTML += s;
         if (confirm('Evaluate history levels?'))
           UI.exec(document.getElementById('mathoutput'),0);
         // Module.print(s);
	}
	else alert('Format de document invalide');
	if (UI.focusaftereval) UI.focused.focus();
      }
    }
  },
  show_level_answers: function(level,b){
    var cur=level.firstChild;
    cur=cur.firstChild;
    cur=UI.skip_buttons(cur);
    var s=cur.innerHTML;
    var pos=s.search("<textarea");
    if (pos<0 || pos>=s.length) return;
    cur=cur.nextSibling; // skip entry field
    if (b)
      cur.style.display='inherit';
    else
      cur.style.display='none';
  },
  show_answers: function(b){
   var out=document.getElementById('mathoutput');
   var cur=out.firstChild;
   while (cur){
     UI.show_level_answers(cur,b);
     cur=cur.nextSibling;
   }
   if (UI.focusaftereval) UI.focused.focus();
  },
  is_alphan:function(c){
    return (c>=48 && c<=57) || (c>=65 && c<=91) || (c>=97 && c<=123) ||c==95;
  },
  erase_button:function(){
    return '<td><button style="width:30px;height:30px;" onclick=\'UI.erase(this)\' title="move level to the trash">del</button></td></tr>';
  },
  move_buttons:function(newline){
   var s='<tr onmouseenter="UI.switch_buttons(this,true)" onmouseleave="UI.switch_buttons(this,false)">';
   s += '<td><button style="width:20px;height:30px;" onclick=\'UI.moveup(this)\' title="move level up">↑</button>';
   if (newline)
     s += '<br><button style="width:20px;height:30px;" onclick=\'UI.movedown(this)\' title="move level down">↓</button></td><td></td>';
   else
     s += '</td><td><button style="width:20px;height:30px;" onclick=\'UI.movedown(this)\' title="move level down">↓</button></td>';
   return s;
  },
   skip_buttons:function(field){
     return field.nextSibling.nextSibling;
   },
  addplotfunc:function(){
  },
  paramname:97,
  curseurhtml:function(name,mini,maxi,step,value){
   var s=UI.move_buttons(!UI.qa);
   s += '<td colspan=3><form onsubmit="setTimeout(function() { rangename.value=valname.value; rangename.step=stepname.value; valname.step=stepname.value;rangename.min=minname.value; rangename.max=maxname.value;UI.eval_below(name.form,name.value,rangename.value);}); return false;">';
   s += '<input style="height:25px" type="text" name="name" size="1" value=\''+name+'\'>';
   s += '='+'<input style="height:25px" type="number" name="valname" onchange="valname.innerHTML=valname.value" value=\''+value+'\' step=\''+step+'\'>';
   s += '<input style="height:25px" type="submit" value="ok">'
   s += '&nbsp;<input style="height:25px" type="number" name="minname" value=\''+mini+'\' step=\''+step+'\'>';
   s += '<input style="height:25px" type="range" name="rangename" onclick="valname.value=value;UI.eval_below(form,form.name.value,value);" value='+value+' min='+mini+' max='+maxi+' step=' + step +'>';
   s += '<input style="height:25px" type="number" name="maxname" value=\''+maxi+'\' step=\''+step+'\'>&nbsp;';
   s += '(step <input style="height:25px" type="number" name="stepname" value=\''+step+'\' step=\''+step/100+'\'>)';
   s += '&nbsp;<input style="height:30px" type="button" value="--" onclick="valname.value -= 10*stepname.value;UI.eval_below(form,form.name.value,valname.value);">';
   s += '&nbsp;<input style="height:30px" type="button" value="- " onclick="valname.value -= stepname.value;UI.eval_below(form,form.name.value,valname.value);">';
   s += '&nbsp;<input style="height:30px" type="button" value="+ " onclick="valname.value -= -stepname.value;UI.eval_below(form,form.name.value,valname.value);">';
   s += '&nbsp;<input style="height:30px" type="button" value="++" onclick="valname.value -= -10*stepname.value;UI.eval_below(form,form.name.value,valname.value);">';
   s += '</form></td>';
   s += UI.erase_button();
   return s;
  },
  addcurseur: function(name,value,mini,maxi,step){
   UI.show_history123();
   UI.caseval('assume('+name+'='+value+')');
   var s=UI.curseurhtml(name,mini,maxi,step,value);
   var out=document.getElementById('mathoutput');
   //Module.print(s);
   out.innerHTML += s;
   UI.scrollatend(out.parentNode);
   UI.link(0);
   if (UI.focusaftereval) UI.focused.focus();
  },
  exec_history: function(){alert('Historique!');},
  set_focused: function(field){ UI.focused=field;},
  svg_counter:0,
  savesvg: function(field){
    var s=field.innerHTML;
    s='<?xml version=\"1.0\" encoding=\"iso-8859-1\"?>\n'+s;
    var blob = new Blob([s], {type: "text/plain;charset=utf-8"});
    filename=document.getElementById("outputfilename").value;
    ++UI.svg_counter;
    filename += UI.svg_counter+".svg";
    saveAs(blob,filename);
  },
   zoom: function(field,scale){
   var prev=field.parentNode.previousSibling.lastChild;
   var ps=prev.innerHTML;
   if (ps.length>22 && ps.substr(0,17)==' <canvas id=\"gl3d'){
     ps=ps.substr(18,7);
     var pos=ps.search('"');
     if (pos>0 && pos<7){
       ps=ps.substr(0,pos);
       if (scale>1) UI.giac_renderer('-'+ps); else UI.giac_renderer('+'+ps);
       return;
     }
   }
   if (prev.firstChild) prev=prev.firstChild;
   // firstChild not required with all browsers
   var box = prev.viewBox.baseVal;
    var w=box.width/1.2,h=box.height/1.2;
    var x=box.x+w/10,y=box.y+h/10;
    //Module.print('current w/h '+w+','+h);
    var cx=x+w/2,cy=y+h/2; // center
    w=scale*w; h=scale*h; // new scales
    // Module.print('new center'+cx+','+cy);
    // Module.print('new w/h'+w+','+h);
    x=cx-w/2; y=cy-h/2;
    cx=x+w; cy=y+h;
    // reeval commandline with gl_x=x..cx and gl_y=y..cy
    var postcmd=';gl_x='+x+'..'+cx+';gl_y='+y+'..'+cy+';';
   //Module.print(prev.parentNode.parentNode.previousSibling.innerHTML);
   //Module.print(postcmd);
   if (prev.parentNode.previousSibling){
     //Module.print(prev.parentNode.parentNode.firstChild.innerHTML);
     UI.reeval(prev.parentNode.parentNode.firstChild,postcmd);
   }
   else
    UI.reeval(prev.parentNode.parentNode.previousSibling.firstChild,postcmd);
  },
  eval_cmdline: function(){
   var value;
   if (cmentree.type!='textarea') value=cmentree.getValue(); else value=entree.value;
   UI.eval_cmdline1(value,true);
  },
  eval_cmdline1:function(value,docaseval){
  UI.set_locale();
  // value=UI.lowercase1(value);
  var out;
  // suppress leading non ascii char
  var n=0;
  for (;n<value.length;n++){
    if (value.charCodeAt(n)>32) break;
  }
  value=value.substr(n,value.length-n);
  for (n=value.length-1;n>=0;n--){
    if (value.charCodeAt(n)>32) break;
  }
  value=value.substr(0,n+1);
  if (cmentree.type!='textarea') cmentree.setValue(value); else entree.value=value;
  var s=' ';
  if (value.length >= 2 && value.substr(0,2)=='//'){
   out=value;
  } else {
    if (docaseval) {
      //Module.print(value);
      if (UI.busy) { out=" Computing kernel is busy."; s=out; } else {out=UI.casevalcb(value,UI.eval_cmdline1cb,value);return;}
    }
    else { out=' Non evalue '; s=out; }
  }
  UI.eval_cmdline1end(value,out,s);
  },
  eval_cmdline1end:function(value,out,s){
  var add=UI.addinput(value,out,s);
  //var s=UI.caseval('mathml(quote('+value+'),1)');
  //add += '&nbsp;&nbsp;'+s.substr(1,s.length-2);
  //Module.print(value+'  ->  '+out);
  if (UI.focusaftereval) cmentree.focus();
  if (cmentree.type!='textarea') cmentree.execCommand('selectAll');
  else {var f=document.activeElement; cmentree.select(); f.focus(); UI.selection=cmentree.value;}
  //document.getElementById('canvas').focus();
  var mathoutput=document.getElementById('mathoutput');
  var tr=document.createElement("TABLE");
  tr.innerHTML += add;
  mathoutput.appendChild(tr.firstChild);
  // mathoutput.innerHTML += add;
  UI.render_canvas(mathoutput.lastChild);
  UI.scrollatend(mathoutput.parentNode);
  UI.link(0);
  if (UI.prettyprint && UI.usemathjax && UI.histcount>0)
    //console.log('"hist'+(UI.histcount-1)+'"');
    MathJax.Hub.Queue(["Typeset",MathJax.Hub,'"hist'+(UI.histcount-1)+'"']);
  },
  eval_cmdline1cb: function(out,value){
   var s;
   if (out.substr(1,4)=='<svg' || out.substr(0,5)=='gl3d ') {
     s=out; out='Done_graphic';
   }
   else {
       if (UI.prettyprint){
         if (UI.usemathjax)
           s='latex(quote('+out+'))';
         else
           s='mathml(quote('+out+'),1)'; //Module.print(s);
         s=UI.caseval(s);
        } else s=out;
   }
   UI.eval_cmdline1end(value,out,s);
  },
  set_locale: function(){
  if (UI.langue==-1){
    var out=UI.caseval('set_langage(0); ');
    UI.langue=1;
  }
  if (UI.initconfigstring!=''){
    UI.caseval(UI.initconfigstring);
    UI.initconfigstring=''
  }
 },
  switch_buttons: function(field,onoff){
    var f=field.firstChild;
    if (onoff) f.style.visibility='visible'; else f.style.visibility='hidden';
    f=f.nextSibling;
    if (onoff) f.style.visibility='visible'; else f.style.visibility='hidden';
    f=field.lastChild;
    if (onoff) f.style.visibility='visible'; else f.style.visibility='hidden';
  },
  exec: function(field,start){
  UI.set_locale();
  var cur=field.firstChild;
  var i=0;
  for (;cur;i++){
   if (i>=start)
     UI.eval_level(cur);
   cur=cur.nextSibling;
   }
   if (UI.focusaftereval) UI.focused.focus();
  },
  eval_below: function(field,name,value){
  //Module.print(name+':='+value);
  UI.caseval('assume('+name+'='+value+')');
  var cur=field.parentNode.parentNode.parentNode;
  cur=cur.nextSibling;
  //Module.print(cur.innerHTML);
  for (;cur;){
   UI.eval_level(cur);
   cur=cur.nextSibling;
  }
  },
 editcomment : function(field){
   var prev=field.parentNode.previousSibling;
   var s=prev.innerHTML;
   s='<td colspan="2"><textarea rows="2" columns="60">'+s+'</textarea>';
   s+='<button onclick="UI.editcomment_end(this)">ok</button></td>';
   prev.innerHTML=s;
   field.parentNode.style.display='none';
 },
 editcomment_end: function(field){
  var prev=field.previousSibling;
  var s='<td colspan="2" onclick="UI.editcomment(this)">'+prev.value+'</td>';
  var par=field.parentNode;
  par.innerHTML=s;
  var l1=par.nextSibling;
  l1.style.display='block';
 },
  eval: function(text,textin){
   UI.set_locale();
   var out=UI.caseval(text);
   var s=' ';
   if (out.substr(1,4)=='<svg' || out.substr(0,5)=='gl3d '){
     // Module.print(text+' -> Done');
     s=out; out='Done_svg';
   }
   else {
     // Module.print(text+' -> '+out);
     if (UI.prettyprint){
      if (UI.usemathjax)
        s=UI.caseval('latex(quote('+out+'))');
      else
      s=UI.caseval('mathml(quote('+out+'),1)');
     } else s=out;
   }
   s=UI.addinput(textin,out,s);
   return s;
  },
  render_canvas:function(field){
   // return; // does not work,
   var n=field.id;
   if (n && n.length>5 && n.substr(0,5)=='gl3d_'){
    Module.print(n);
    var n3d=n.substr(5,n.length-5);
   //Module.print(n3d);
    //Module.canvas=document.getElementById(n);
    UI.giac_renderer(n3d);
    //Module.canvas=document.getElementById('canvas');
    return;
   }
   var f=field.firstChild;
   for (;f;f=f.nextSibling){
     UI.render_canvas(f);
   }
  },
  reeval: function(field,postcmd){
  // field=field.previousSibling;
  if (field.type!='textarea'){ var t=field.getTextArea(); t.value=field.getValue();field=t;}
  var s=field.value;
  var par=field.parentNode;
  par=par.parentNode;
  s=UI.eval(s+postcmd,s);
  par.innerHTML=s;
  UI.render_canvas(par);
  UI.link(0);
  if (UI.prettyprint && UI.usemathjax && UI.histcount>0){
    //console.log('"hist'+(UI.histcount-1)+'"');
    MathJax.Hub.Queue(["Typeset",MathJax.Hub,'"hist'+(UI.histcount-1)+'"']);
  }
  if (UI.focusaftereval){
    par=par.parentNode.nextSibling;
    if (par==null) cmentree.focus(); // console.log(par);
    else {
      par=par.firstChild.firstChild.nextSibling.nextSibling.firstChild;
      par.focus();
    }
   }
  },
  eval_level: function(field){
   // ? use cur.nodeType instead of search?
   var s=field.innerHTML;
   var pos=s.search("<textarea");
   if (pos<0 || pos>=s.length){
    pos=s.search("<form");
    if (pos>0 && pos<s.length){
      var level=field.firstChild;
      var cur=level.firstChild;
      cur=UI.skip_buttons(cur);
      //Module.print(cur.innerHTML);
       cur=cur.firstChild;
       // Module.print(cur.name.value+':='+cur.rangename.value);
       UI.caseval(cur.name.value+':='+cur.rangename.value);
       var s=UI.curseurhtml(cur.name.value,cur.minname.value,cur.maxname.value,cur.stepname.value,cur.valname.value);
       level.innerHTML=s;
    }
    return;
  }
    var cur=field.firstChild;
    cur=cur.firstChild;
    cur=UI.skip_buttons(cur);
    cur=cur.firstChild;
    var s=cur.value;
    s=UI.eval(s,s);
    field.innerHTML=s;
    UI.render_canvas(field);
    if (UI.prettyprint && UI.usemathjax )
      MathJax.Hub.Queue(["Typeset",MathJax.Hub,field]);
  },
  before: function(field){
  var s='';
  while ((field=field.previousSibling)){
    s += field.innerHTML;
  }
   return s;
  },
  after: function(field){
  var s='';
  while ((field=field.nextSibling)){
    s += field.innerHTML;
  }
   return s;
  },
addcomment: function(text){
         UI.show_history123();
  var s=UI.move_buttons(!UI.qa);
  s += '<td colspan="2">'+text.substr(2,text.length-2)+'</td>';
  s += '<td> <button onclick="UI.editcomment(this);">edit</td>';
  s += UI.erase_button();
  return s;
  },
  prepare_cm: function(txt,h,cm){
  cm.setSize(null,h+20);
  cm.on("focus",function(cm){ UI.set_focused(cm); });
  cm.on("blur",function(cmf) {
  if (cmf.getSelection().length > 0){UI.selection=cmf.getSelection();}
  cmf.toTextArea();
  });
  cm.setOption("extraKeys", {
   Enter: function(cm){
     var txt=cm.getTextArea();
     cm.toTextArea();
     UI.reeval(txt,'');
   },
  F1: function(cm) {
    UI.completion(cm);
   },
  Tab: function(cm) {
    UI.completion(cm);
    //cm.toTextArea();
   }
  });
  var pos=txt.selectionStart;
  cm.setCursor({line:0,ch:pos}); cm.refresh();
  },
  count_newline: function(text){
   var k=0,r=0;
   for (;k<text.length;++k){
     if (text.charCodeAt(k)==10)
       ++r;
   }
   return r;
  },
  addinput: function(textin,textout,mathmlout){
 document.getElementById('startup_restore').style.display='none'
  if (mathmlout.length>=5 && mathmlout.substr(0,5)=='gl3d '){ document.getElementById('boutons_3d').style.display='inherit';document.getElementById('boutons_3d0').style.display='inherit';}
  if (textin.length > 2 && textin.substr(0,2)=='//') return UI.addcomment(textin);
         UI.show_history123();
// document.getElementById('mathoutput').style.listStyleType = 'none';
  var is_svg=mathmlout.substr(1,4)=='<svg';
  var is_3d=mathmlout.substr(0,5)=='gl3d ';
  var s=UI.move_buttons(!UI.qa);
  var delbut=false;
  if (textin.charCodeAt(0)==63)
    s += '<td colspan="2">'+UI.renderhelp(textout)+'</td><td>';
  else {
      if (UI.qa)
      s += '<td>';
    else
      s += '<td colspan=2>';
    s += '<textarea class="historyinput" ';
    if (is_svg && UI.qa) s+='rows=8 style="font-size:large"';
    else s += 'style="height:'+(20+16*UI.count_newline(textin))+'px; font-size:large"';
    s += ' title="Shift-Enter: newline, Enter: eval" onkeypress="UI.ckenter(event,this)" onblur="UI.updatelevel(this);" onfocus="if (UI.usecm){var h=offsetHeight;var cm=CodeMirror.fromTextArea(this,{ matchBrackets: true}); UI.prepare_cm(this,h,cm); UI.changefontsize(cm,16); UI.set_focused(cm);} else UI.set_focused(this);" onselect="if (UI.getsel(this).length>0) UI.selection=UI.getsel(this);">'+textin+'</textarea>';
// (navigator.userAgent.match(/Android/i) ||  navigator.userAgent.match(/webOS/i) || navigator.userAgent.match(/iPhone/i) || navigator.userAgent.match(/iPad/i) || navigator.userAgent.match(/iPod/i) || navigator.userAgent.match(/BlackBerry/i) || navigator.userAgent.match(/Windows Phone/i))
    if (UI.qa) s += '</td>';
    if (is_svg || is_3d){
      if (UI.qa) s += '<td>'; else s+='<br>';
      if (is_svg)
        s += '<div style="text-align:center">'+mathmlout.substr(1,mathmlout.length-2)+'</div></td>';
      else {
	var n3d=mathmlout.substr(5,mathmlout.length-5);
	// Module.print(n3d);
	if (0)
	s += '<div style="text-align:center"> 3d </div></td>';
	else s += '<div style="text-align:center"> <canvas id="gl3d_'+n3d+'" onmousedown="UI.canvas_pushed=true;UI.canvas_lastx=event.clientX; UI.canvas_lasty=event.clientY;" onmouseup="UI.canvas_pushed=false;" onmousemove="UI.canvas_mousemove(event,'+n3d+')" width=400 height=250></canvas></div></td>';
      }
      s += '<td><button style="height:25px" onclick="UI.zoom(this,1.414)">out</button><br>';
      s += '<button style="height:25px" onclick="UI.zoom(this.previousSibling,0.707)">in</button><br>';
      if (is_svg) s += '<button style="height:25px" onclick="UI.savesvg(parentNode.previousSibling)">sav</button><br>';
      s += '<br><button style="height:25px;" onclick=\'UI.erase(this)\' title="placer ce niveau dans la corbeille">del</button>'; delbut=true;
      s += '</td>';
    }
    else {
      if (UI.qa) s += '<td>';
      s += '<div style="color:blue; text-align:center" title="Double click: see in text mode (useful for copy-paste)" class="outdiv" ondblclick="nextSibling.style.display=\'inherit\';this.nextSibling.select();UI.selection=nextSibling.value;this.style.display=\'none\';this.nextSibling.nextSibling.style.display=\'inherit\';" id="hist'+UI.histcount+'">';
      UI.histcount++;
      if (UI.prettyprint){
       if (UI.usemathjax)
        s += '$$'+mathmlout.substr(1,mathmlout.length-2)+'$$';
       else
        s += mathmlout.substr(1,mathmlout.length-2);
      } else s += mathmlout;
      s += '</div>';
      s += '<textarea class="outdiv" onfocus="UI.set_focused(this)" onselect="if (UI.getsel(this).length>0) UI.selection=UI.getsel(this);" style="display:none">'+textout+'</textarea>';
      s += '<button style="display:none" onclick="previousSibling.previousSibling.style.display=\'block\'; previousSibling.style.display=\'none\';this.style.display=\'none\'">cancel</button>';
      s += '</td>';
      s += '<td><button style="width:20px;height:30px;" onclick=\'UI.insert(UI.focused,"evalf('+textin+')")\' title="Find approx. value" style="color:blue">~</button>';
     if (!UI.qa) { s += '<button style="height:25px;" onclick=\'UI.erase(this)\' title="placer ce niveau dans la corbeille">del</button>'; delbut=true; }
      s +='</td>';
      }
  }
  if (delbut) s += '</tr>'; else s += UI.erase_button();
  return s;
},
giac_renderer: function(text){
var gr = Module.cwrap('_ZN4giac13giac_rendererEPKc','number', ['string']);
gr(text);
},
  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  if (pos1<0) return sorig;
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  s=s.substr(pos1+4,s.length-pos1-4);
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  else
    s = explication.substr(0,pos0);
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    if (pos1 < 0) break;
    var cmd=voiraussi.substr(0,pos1);
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      s += '<button style="height:25px" onmousedown="event.preventDefault()" onclick="UI.addhelp(\'?\',\''+cmd+'\')">'+cmd+'</button>';
    else
      s += '<button style="height:25px" onmousedown="event.preventDefault()" onclick="document.getElementById(\'helptxt\').value=\''+cmd+'\';UI.insert(UI.focused,\''+UI.clean(cmd,true)+'(\')">'+cmd+'</button>';
    voiraussi = voiraussi.substr(pos1+1,voiraussi.length-pos1-1);
  }
  if (found)
    s += '<button style="height:25px" onmousedown="event.preventDefault()" onclick="UI.addhelp(\'?\',\''+voiraussi+'\')">'+voiraussi+'</button>';
  else
    s += '<button style="height:25px" onmousedown="event.preventDefault()" onmousedown="event.preventDefault()" onclick="UI.insert(UI.focused,\''+voiraussi+'(\')">'+voiraussi+'</button>';
  pos1=examples.search(';');
  if (pos1>=0){
   s += '<br>Examples: ';
   while (true){
    pos1=examples.search(';');
    if (pos1<0) break;
    var cmd=examples.substr(0,pos1);
    cmd=cmd.replace(/>/g,'&gt;');
    cmd=cmd.replace(/</g,'&lt;');
    s += '<button style="height:25px" onmousedown="event.preventDefault()" onclick="UI.insert(UI.focused,\''+UI.clean(cmd,true)+'\')">'+cmd+'</button>';
    examples = examples.substr(pos1+1,examples.length-pos1-1);
   }
  }
  s += '<button style="height:25px" onmousedown="event.preventDefault()" onclick="UI.insert(UI.focused,\''+examples+'\')">'+examples+'</button>';
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getsel:function(field){
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var endPos = field.selectionEnd;
    var selectedText = field.value.substring(startPos, endPos);
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move_caret_or_focus:function(field,n){
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 if (UI.detectmob()){ UI.moveCaret(field,n); return; }
  move_focus(field,n);
},
move_focus:function(field,n){
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  if (field.previousSibling==null){
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   UI.switch_buttons(par.parentNode,true)
   par=par.nextSibling;
   par=par.firstChild;
   if (par.nextSibling==null){
     par=par.parentNode.parentNode.parentNode.nextSibling;
     if (par==null) cmentree.focus(); // console.log(par);
     else {
      UI.switch_buttons(par.firstChild,true)
      par=par.firstChild.firstChild.nextSibling.nextSibling.firstChild;
      par.focus();
     }
     return;
   }
   par.style.display='none';
   par=par.nextSibling;
   par.style.display='inherit';
   par.select();
   UI.set_focused(par);
   par.focus();
   return;
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  var bidon=field.previousSibling;
  if (bidon.style.display!='none') return;
  bidon.style.display='block';
  field.style.display='none';
  var par=field.parentNode.parentNode.parentNode.nextSibling;
  if (par==null) {
   UI.set_focused(cmentree); cmentree.focus();
   //  console.log(par);
  }
  else {
    UI.switch_buttons(par.firstChild,true)
    par=par.firstChild.firstChild.nextSibling.nextSibling.firstChild;
    par.focus();
   }
  return;
 }
 if (field==cmentree){
  var par=document.getElementById('mathoutput').lastChild;
  if (par==null) return;
   UI.switch_buttons(par.firstChild,true)
   par=par.firstChild.firstChild.nextSibling.nextSibling.nextSibling.firstChild;
   if (par.nextSibling==null){
    par=par.parentNode.previousSibling.firstChild;
    par.focus(); return;
   }
   //console.log(par.innerHTML);
   par.style.display='none';
   par=par.nextSibling;
   par.style.display='inherit';
   par.select();
   UI.set_focused(par);
   par.focus();
   return;
 }
  if (field.type!="textarea")
   field=field.getTextArea();
  if (field.previousSibling==null){
   var par=field.parentNode.parentNode.parentNode.previousSibling;
   UI.switch_buttons(par.firstChild,true)
   par=par.firstChild.firstChild.nextSibling.nextSibling.nextSibling.firstChild;
   if (par.nextSibling==null){
    //console.log(par.nextSibling);
    par=par.parentNode.previousSibling.firstChild;
    par.focus(); return;
   }
   par.style.display='none';
   par=par.nextSibling;
   par.style.display='inherit';
   par.select();
   UI.set_focused(par);
   par.focus();
   return;
  }
  var bidon=field.previousSibling;
  if (bidon.style.display!='none') return;
  bidon.style.display='block';
  field.style.display='none';
  var par=field.parentNode.previousSibling.firstChild;
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},
selline:0,
selch:0,
setselbeg:function(field){
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    var pos=field.getCursor(); // save position
    UI.selline=pos.line; UI.selch=pos.ch;
    //console.log(UI.selline,UI.selch);
    return;
  }
  UI.selch=field.selectionStart;
},
setselend:function(field){
  if (field.type!="textarea"){
    var startpos=field.getCursor(); // current position
    field.setSelection({line: UI.selline,ch:UI.selch },startpos);
    field.refresh();
    UI.selection=field.getSelection();
    return;
  }
  var pos1=field.selectionStart;
  var pos2=UI.selch;
  if (pos2>field.value.length) pos2=field.value.length;
  if (pos1>pos2){ var tmp=pos1; pos1=pos2; pos2=tmp; }
  field.setSelectionRange(pos1,pos2);
  UI.selection=field.value.substr(pos1,pos2-pos1);
},
indentline:function(field){
 if (field.type!='textarea') field.execCommand('indentAuto');
},
moveCaret: function(field, charCount) {
  if (field.type!="textarea"){
    var pos=field.getCursor();
    pos.ch = pos.ch+charCount;
    field.setCursor(pos);
    field.refresh();
    return;
  }
  var pos=field.selectionStart;
  pos = pos+charCount;
  if (pos<0) pos=0;
  if (pos>field.value.length) pos=field.value.length;
  field.setSelectionRange(pos,pos);
  },
moveCaretUpDown: function(field, Count) {
  if (field.type!="textarea"){
    var pos=field.getCursor();
    pos.line = pos.line+Count;
    field.setCursor(pos);
    field.refresh();
    //UI.show_curseur();
    return;
  }
  if (Count<-1){
    var i;
    for (i=0;i>Count;i--)
     UI.moveCaretUpDown(field,-1);
    return;
  }
  if (Count>1){
    var i;
    for (i=0;i<Count;i++)
     UI.moveCaretUpDown(field,1);
    return;
  }
  var pos=field.selectionStart;
  var s=field.value;
  var cur=pos,shift=pos+1,pos1;
  cur--;
  if (cur>=s.length) cur--;
  for (;cur>=0;cur--){
    if (s.charCodeAt(cur)==10){ shift=pos-cur; break; }
  }
  if (Count==-1){
   if (cur<0) return;
   pos1=cur;cur--;
   for (;cur>=0;cur--){
     if (s.charCodeAt(cur)==10) break;
   }
   //console.log(cur,shift);
   pos=cur+shift;
   if (pos>pos1) pos=pos1;
  }
  if (Count==1){
    cur=pos;
    for (;cur<s.length;cur++){
      if (s.charCodeAt(cur)==10) break;
    }
    pos=cur+shift;
    if (pos>=s.length) return;
    pos1=pos;
    for (;pos1>cur;pos1--){
      if (s.charCodeAt(pos1)==10) pos=pos1;
    }
  }
  if (pos<0) pos=0;
  if (pos>field.value.length) pos=field.value.length;
  field.setSelectionRange(pos,pos);
  },
  erase: function(field){
  var par=field.parentNode;
  par=par.parentNode;
  par.style.visibility='hidden';
  if (UI.focusaftereval) UI.focused.focus();
  par=par.parentNode;
  var list = par.parentNode;
  if (list.id=='helpoutput')
    list.removeChild(par);
  },
  erase_all_warn:1,
  erase_all: function(field){
    var cur=field.firstChild;
    while (cur){
     cur.firstChild.style.visibility='hidden';
     cur=cur.nextSibling;
    }
    if (UI.erase_all_warn==1){
     alert('Click on Trash restore to cancel. Click on Trash empty to confirm');
     UI.erase_all_warn=0;
    }
    if (UI.focusaftereval) cmentree.focus();
  },
  restoretrash:function(){
  var hist=document.getElementById('mathoutput');
  var cur=hist.firstChild;
  while (cur){
    if (cur.firstChild.style.visibility=='hidden')
      cur.firstChild.style.visibility='visible';
    cur=cur.nextSibling;
  }
  },
  emptytrash:function(){
  var hist=document.getElementById('mathoutput');
  var cur=hist.firstChild;
  while (cur){
    var nxt=cur.nextSibling;
    if (cur.firstChild.style.visibility=='hidden')
      hist.removeChild(cur);
    cur=nxt;
  }
   UI.link(0);
  },
updatelevel: function(field){
  var pos=field.selectionStart;
  field.innerHTML=field.value;
  if (pos>=0 && pos<field.value.length)
    field.setSelectionRange(pos,pos);
},
  moveup: function(field){
  var par=field.parentNode;
  par=par.parentNode;
  par=par.parentNode;
  var prev=par.previousSibling;
  var list = par.parentNode;
  list.removeChild(par);
  list.insertBefore(par,prev);
  if (UI.focusaftereval) UI.focused.focus();
  },
  movedown: function(field){
  var par=field.parentNode;
  par=par.parentNode;
  par=par.parentNode;
  var nxt=par.nextSibling;
  nxt=nxt.nextSibling;
  var list = par.parentNode;
  list.removeChild(par);
  list.insertBefore(par,nxt);
  },
  backspace: function(field){
    //if (UI.focusaftereval) field.focus();
    if (field.type!="textarea"){
      var start=field.getCursor('from');
      var end=field.getCursor('to');
      if (end.line!=start.line || end.ch!=start.ch)
        field.replaceSelection('');
      else {
        var c=start.ch; var l=start.line;
        if (start.ch==0 && start.line==0) return;
        if (c>0){ c--; field.replaceRange('',{line: l,ch:c},end); }
        else { l--; var s=field.getRange({line: l,ch:c},end); field.replaceRange('',{line: l,ch:s.length-1},end); }
      }
      var t=field.getTextArea(); t.value=field.getValue();
    } else {
      var pos = field.selectionStart;
      var pos2 = field.selectionEnd;
      var s=field.value;
      if (pos<pos2){
        field.value = s.substring(0, pos)+s.substring(pos2,s.length);
        if (pos<0) pos=0;
        if (pos>field.value.length) pos=field.value.length;
        field.setSelectionRange(pos,pos);
        UI.resizetextarea(field);
        return;
      }
      if (pos>0){
        field.value = s.substring(0, pos-1)+s.substring(pos,s.length);
        pos--;
        if (pos<0) pos=0;
        if (pos>field.value.length) pos=field.value.length;
        field.setSelectionRange(pos,pos);
        UI.resizetextarea(field);
      }
    }
  },
insert: function(myField, myValue) {
 if (UI.focusaftereval) myField.focus();
 if (myField.type!="textarea"){
  myField.replaceSelection(myValue);
  myField.execCommand("indentAuto");
  var t=myField.getTextArea(); t.value=myField.getValue();
 }
 else {
  var pos=myField.selectionStart;
  pos=pos+myValue.length;
  //IE support
  if (document.selection) {
    if (UI.focusaftereval) myField.focus();
    var sel = document.selection.createRange();
    sel.text = myValue;
  }
  //MOZILLA and others
  else {
    var startPos = myField.selectionStart;
    var endPos = myField.selectionEnd;
    if (myField.selectionStart || myField.selectionStart == '0') {
        myField.value = myField.value.substring(0, startPos)
            + myValue
            + myField.value.substring(endPos, myField.value.length);
    } else {
        myField.value += myValue;
    }
  }
  myField.setSelectionRange(pos,pos);
  UI.resizetextarea(myField);
  }
},
  resizetextarea:function(field){
    if (field.type!='textarea') return;
    var s=field.value;
    var N=0,i,n=s.length,c;
    for (i=0;i<n;i++){
      c=s.charCodeAt(i);
      if (c==10) N++;
    }
    if (field.rows!=N+1) field.rows=N+1;
  },
  changefontsize:function(field,size){
    field.getWrapperElement().style["font-size"] = size+"px";
    field.refresh();
  }
  }; // closing UI={
  // remove existing codemirror field
  prog=document.getElementById('prog');
  if (prog && prog.nextSibling){
    prog.parentNode.removeChild(prog.nextSibling);
  }
  if (entree && entree.nextSibling){
    entree.parentNode.removeChild(entree.nextSibling);
  }
  document.getElementById('canvas').onmousemove=function(event){ UI.canvas_mousemove(event,'');};
  document.getElementById('output').style.display='none';
  document.getElementById("config").reset();
  // connect to canvas
  var Module = {
        worker:false,
        htmlcheck:true,
        htmlbuffer:'',
        preRun: [],
        postRun: [],
        print: (function() {
          var element = document.getElementById('output');
          element.innerHTML='';// element.value = ''; // clear browser cache
          return function(text) {
            //console.log(text.charCodeAt(0));
            if (text.length==1 && text.charCodeAt(0)==12){ element.innerHTML=''; return; }
            if (text.length>=1 && text.charCodeAt(0)==2) {console.log('STX');Module.htmlcheck=false; htmlbuffer='';return;}
            if (text.length>=1 && text.charCodeAt(0)==3) {console.log('ETX');Module.htmlcheck=true; element.style.display='inherit'; element.innerHTML += htmlbuffer;htmlbuffer='';element.scrollTop = 99999; return;}
            if (Module.htmlcheck){
            // These replacements are necessary if you render to raw HTML
             text = text.replace(/&/g, "&amp;");
             text = text.replace(/</g, "&lt;");
             text = text.replace(/>/g, "&gt;");
             text = text.replace(/\n/g, '<br>');
             text += '<br>'
             element.style.display='inherit';
             element.innerHTML += text; // element.value += text + "\n";
             element.scrollTop = 99999; // focus on bottom
            } else htmlbuffer += text;
          };
        })(),
        printErr: function(text) {
          if (0) { // XXX disabled for safety typeof dump == 'function') {
            dump(text + '\n'); // fast, straight to the real console
          } else {
            console.log(text);
          }
        },
        canvas: document.getElementById('canvas'),
        setStatus: function(text) {
          if (Module.setStatus.interval) clearInterval(Module.setStatus.interval);
          var m = text.match(/([^(]+)\((\d+(\.\d+)?)\/(\d+)\)/);
          var statusElement = document.getElementById('status');
          var progressElement = document.getElementById('progress');
          if (m) {
            text = m[1];
            progressElement.value = parseInt(m[2])*100;
            progressElement.max = parseInt(m[4])*100;
            progressElement.hidden = false;
          } else {
            progressElement.value = null;
            progressElement.max = null;
            progressElement.hidden = true;
          }
          statusElement.innerHTML = text;
        },
        totalDependencies: 0,
        monitorRunDependencies: function(left) {
          this.totalDependencies = Math.max(this.totalDependencies, left);
          Module.setStatus(left ? 'Preparation... (' + (this.totalDependencies-left) + '/' + this.totalDependencies + ')' : 'Telechargements termines.');
        }
      };
      Module.setStatus('Preparing (may take 1 or 2 minutes the first time)');
    </script>
  <script src="giac.js" async></script>
<script src="longhelp.js"></script>

<script language="javascript">
  CodeMirror.registerHelper("hintWords", "simplemode",UI.xcascmd);
// En ajoutant async a la fin de script src=giac.js on accelere les chargements
// de la page nue (cache), mais pas si il y a un lien
  cmentree=entree;
  window.onresize=UI.set_config_width;
 window.onload = function(e){
  //UI.caseval('abc(x=0); [x, y]; z+1;');
  var form=document.getElementById('config');
  var hw=window.innerWidth-50;
  if (hw>=1000){ UI.qa=true; form.qa.checked=true; UI.usecm=true; form.usecm.checked=true;}
  else {UI.qa=false; form.qa.checked=false; UI.usecm=true; form.usecm.checked=true;}
  // config in cookies
  var ck;
  ck=UI.readCookie('xcas_digits');
  if (ck) form.digits_mode.value=eval(ck);
  ck=UI.readCookie('xcas_angle_radian');
  if (ck) form.angle_mode.checked=(ck=='1');
  ck=UI.readCookie('xcas_complex_mode');
  if (ck) form.complex_mode.checked=(ck=='1');
  ck=UI.readCookie('xcas_with_sqrt');
  if (ck) form.sqrt_mode.checked=(ck=='1');
  ck=UI.readCookie('xcas_step_infolevel');
  if (ck) form.step_mode.checked=(ck=='1');
  ck=UI.readCookie('xcas_autosimplify');
  if (ck) form.autosimp_level.value=eval(ck);
  ck=UI.readCookie('xcas_docprefix');
  if (ck) UI.docprefix=ck;
  ck=UI.readCookie('xcas_withworker');
  if (ck) form.worker_mode.checked=(ck=='1');
  UI.withworker=form.worker_mode.checked;
  ck=UI.readCookie('xcas_prettyprint');
  if (ck) form.prettyprint.checked=(ck=='1');
  UI.prettyprint=form.prettyprint.checked;
  ck=UI.readCookie('xcas_qa');
  if (ck) form.qa.checked=UI.qa=(ck=='1');
  ck=UI.readCookie('xcas_usecm');
  if (ck) form.usecm.checked=UI.usecm=(ck=='1');
  ck=UI.config_string(); console.log(ck);
  if (0) UI.caseval(ck); else UI.initconfigstring=ck; //UI.set_config_width();
  var ua = window.navigator.userAgent;
  var old_ie = ua.indexOf('MSIE ');
  var new_ie = ua.indexOf('Trident/');
  // if (window.chrome && hw<1000) UI.prettyprint=false;
  if ((old_ie > -1) || (new_ie > -1)) UI.isie=true;
  var bt=UI.browser_type();
  if (UI.isie || (bt!=1 && bt!=2)){
    UI.usemathjax=true;
    var alertmsg="Consider switching to Firefox for faster results and better rendering";
    if (UI.isie) alertmsg="3d does not work with Internet Explorer. "+alertmsg;
    alert(alertmsg);
  }
 if (!UI.is_touch_device()) w3IncludeHTML(); // context-menu
 // if (bt==1 && hw>=1000) w3IncludeHTML();
 document.getElementById('apropos').style.display='none';
 document.getElementById('help').style.display='none';
 console.log("window.onload");
 var hist=document.getElementById('mathoutput');
 var doexec=false;
 var asked=false;
 if (hist.firstChild){
  asked=true;
  if (!UI.withworker && confirm('Evaluate history levels?')) {
   doexec=true;
  }
  // else {alert('Historique non execute');}
 }
 var hashParams = window.location.hash.substr(1);
 // substr(1) to remove the `#`
 if (UI.readCookie('xcas_session')!=null) document.getElementById('startup_restore').style.display='block';
 //UI.restoresession(hashParams,hist,asked,doexec);
  window.setTimeout(UI.restoresession,200,hashParams,hist,asked,doexec);
  document.getElementById('startup1').style.display='block';
}
</script>

</body>
</html>