Blame view

Modif/epsilon-master/apps/regression/model/quadratic_model.cpp 2.44 KB
6663b6c9   adorian   projet complet av...
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
  #include "quadratic_model.h"
  #include "../../shared/poincare_helpers.h"
  #include <math.h>
  #include <assert.h>
  #include "../../poincare/include/poincare_layouts.h"
  
  using namespace Poincare;
  using namespace Shared;
  
  namespace Regression {
  
  ExpressionLayout * QuadraticModel::layout() {
    static ExpressionLayout * layout = nullptr;
    if (layout == nullptr) {
      const ExpressionLayout * layoutChildren[] = {
        new CharLayout('a', KDText::FontSize::Small),
        new CharLayout(Ion::Charset::MiddleDot, KDText::FontSize::Small),
        new CharLayout('X', KDText::FontSize::Small),
        new VerticalOffsetLayout(
            new CharLayout('2', KDText::FontSize::Small),
            VerticalOffsetLayout::Type::Superscript,
            false),
        new CharLayout('+', KDText::FontSize::Small),
        new CharLayout('b', KDText::FontSize::Small),
        new CharLayout(Ion::Charset::MiddleDot, KDText::FontSize::Small),
        new CharLayout('X', KDText::FontSize::Small),
        new CharLayout('+', KDText::FontSize::Small),
        new CharLayout('c', KDText::FontSize::Small),
      };
      layout = new HorizontalLayout(layoutChildren, 10, false);
    }
    return layout;
  }
  
  Expression * QuadraticModel::simplifiedExpression(double * modelCoefficients, Poincare::Context * context) {
    double a = modelCoefficients[0];
    double b = modelCoefficients[1];
    double c = modelCoefficients[2];
    Expression * ax2Expression = new Multiplication(
        new Decimal(a),
        new Power(
          new Symbol('x'),
          new Decimal(2.0),
          false),
        false);
    Expression * bxExpression = new Multiplication(
      new Decimal(b),
      new Symbol('x'),
      false);
    Expression * cExpression = new Decimal(c);
    Expression * const operands[] = {ax2Expression, bxExpression, cExpression};
    Expression * result = new Addition(operands, 3, false);
    PoincareHelpers::Simplify(&result, *context);
    return result;
  }
  
  double QuadraticModel::evaluate(double * modelCoefficients, double x) const {
    double a = modelCoefficients[0];
    double b = modelCoefficients[1];
    double c = modelCoefficients[2];
    return a*x*x+b*x+c;
  }
  
  double QuadraticModel::partialDerivate(double * modelCoefficients, int derivateCoefficientIndex, double x) const {
    if (derivateCoefficientIndex == 0) {
      // Derivate: x^2
      return x*x;
    }
    if (derivateCoefficientIndex == 1) {
      // Derivate: x
      return x;
    }
    if (derivateCoefficientIndex == 2) {
      // Derivate: 1
      return 1;
    }
    assert(false);
    return 0.0;
  }
  
  }