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682f12a1ef
The model does not keep a pointer to the simplifiedExpression, the method calling simplifiedExpression should delete it afterwards
92 lines
3.1 KiB
C++
92 lines
3.1 KiB
C++
#include "trigonometric_model.h"
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#include "../../poincare/include/poincare_layouts.h"
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#include <math.h>
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#include <poincare/preferences.h>
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#include <assert.h>
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using namespace Poincare;
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namespace Regression {
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ExpressionLayout * TrigonometricModel::layout() {
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static ExpressionLayout * layout = nullptr;
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if (layout == nullptr) {
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const ExpressionLayout * layoutChildren[] = {
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new CharLayout('a', KDText::FontSize::Small),
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new CharLayout(Ion::Charset::MiddleDot, KDText::FontSize::Small),
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new CharLayout('s', KDText::FontSize::Small),
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new CharLayout('i', KDText::FontSize::Small),
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new CharLayout('n', KDText::FontSize::Small),
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new CharLayout('(', KDText::FontSize::Small),
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new CharLayout('b', KDText::FontSize::Small),
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new CharLayout(Ion::Charset::MiddleDot, KDText::FontSize::Small),
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new CharLayout('X', KDText::FontSize::Small),
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new CharLayout('+', KDText::FontSize::Small),
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new CharLayout('c', KDText::FontSize::Small),
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new CharLayout(')', KDText::FontSize::Small),
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new CharLayout('+', KDText::FontSize::Small),
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new CharLayout('d', KDText::FontSize::Small)
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};
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layout = new HorizontalLayout(layoutChildren, 14, false);
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}
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return layout;
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}
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Expression * TrigonometricModel::simplifiedExpression(double * modelCoefficients, Poincare::Context * context) {
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double a = modelCoefficients[0];
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double b = modelCoefficients[1];
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double c = modelCoefficients[2];
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double d = modelCoefficients[3];
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Expression * aExpression = new Decimal(a);
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Expression * sinExpression = new Sine(
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new Addition(
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new Multiplication(
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new Decimal(b),
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new Symbol('x'),
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false),
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new Decimal(c),
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false),
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false);
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Expression * asinExpression = new Multiplication(aExpression, sinExpression, false);
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Expression * dExpression = new Decimal(d);
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Expression * result = new Addition(asinExpression, dExpression, false);
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Expression::Simplify(&result, *context);
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return result;
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}
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double TrigonometricModel::evaluate(double * modelCoefficients, double x) const {
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double a = modelCoefficients[0];
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double b = modelCoefficients[1];
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double c = modelCoefficients[2];
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double d = modelCoefficients[3];
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double radianX = Poincare::Preferences::sharedPreferences()->angleUnit() == Poincare::Expression::AngleUnit::Radian ? x : x * M_PI/180.0;
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return a*sin(b*radianX+c)+d;
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}
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double TrigonometricModel::partialDerivate(double * modelCoefficients, int derivateCoefficientIndex, double x) const {
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double a = modelCoefficients[0];
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double b = modelCoefficients[1];
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double c = modelCoefficients[2];
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double radianX = Poincare::Preferences::sharedPreferences()->angleUnit() == Poincare::Expression::AngleUnit::Radian ? x : x * M_PI/180.0;
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if (derivateCoefficientIndex == 0) {
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// Derivate: sin(b*x+c)
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return sin(b*radianX+c);
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}
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if (derivateCoefficientIndex == 1) {
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// Derivate: x*a*cos(b*x+c);
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return radianX*a*cos(b*radianX+c);
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}
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if (derivateCoefficientIndex == 2) {
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// Derivate: a*cos(b*x+c)
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return a*cos(b*radianX+c);
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}
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if (derivateCoefficientIndex == 3) {
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// Derivate: 1
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return 1.0;
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}
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assert(false);
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return 0.0;
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}
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}
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