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ac6f23684d
Before: Opposite(Opposite(Rational(1))) misleadingly created the expression "-1"; now, Opposite::Builder(Opposite::Builder(Rational(1))) creates "--1"
100 lines
3.2 KiB
C++
100 lines
3.2 KiB
C++
#include "trigonometric_model.h"
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#include "../../shared/poincare_helpers.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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#include <poincare/char_layout.h>
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#include <poincare/horizontal_layout.h>
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#include <poincare/vertical_offset_layout.h>
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#include <poincare/number.h>
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#include <poincare/symbol.h>
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#include <poincare/addition.h>
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#include <poincare/multiplication.h>
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#include <poincare/power.h>
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#include <poincare/sine.h>
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using namespace Poincare;
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using namespace Shared;
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namespace Regression {
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Layout TrigonometricModel::layout() {
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if (m_layout.isUninitialized()) {
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const Layout layoutChildren[] = {
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CharLayout('a', KDFont::SmallFont),
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CharLayout(Ion::Charset::MiddleDot, KDFont::SmallFont),
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CharLayout('s', KDFont::SmallFont),
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CharLayout('i', KDFont::SmallFont),
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CharLayout('n', KDFont::SmallFont),
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CharLayout('(', KDFont::SmallFont),
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CharLayout('b', KDFont::SmallFont),
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CharLayout(Ion::Charset::MiddleDot, KDFont::SmallFont),
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CharLayout('X', KDFont::SmallFont),
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CharLayout('+', KDFont::SmallFont),
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CharLayout('c', KDFont::SmallFont),
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CharLayout(')', KDFont::SmallFont),
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CharLayout('+', KDFont::SmallFont),
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CharLayout('d', KDFont::SmallFont)
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};
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m_layout = HorizontalLayout::Builder(layoutChildren, 14);
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}
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return m_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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// a*sin(bx+c)+d
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Expression result =
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Addition::Builder(
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Multiplication::Builder(
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Number::DecimalNumber(a),
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Sine::Builder(
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Addition::Builder(
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Multiplication::Builder(
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Number::DecimalNumber(b),
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Symbol('x')),
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Number::DecimalNumber(c)))),
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Number::DecimalNumber(d));
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PoincareHelpers::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::Preferences::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::Preferences::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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