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807dd73e7b
The Tuple is simply an initializer_list along with a convenience method to cast between a list of TreeHandle and a list of Expression
87 lines
2.3 KiB
C++
87 lines
2.3 KiB
C++
#include "quadratic_model.h"
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#include "../../shared/poincare_helpers.h"
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#include <math.h>
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#include <assert.h>
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#include <poincare/code_point_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/decimal.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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using namespace Poincare;
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using namespace Shared;
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namespace Regression {
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Layout QuadraticModel::layout() {
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if (m_layout.isUninitialized()) {
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m_layout = HorizontalLayout::Builder({
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CodePointLayout::Builder('a', k_layoutFont),
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CodePointLayout::Builder(UCodePointMiddleDot, k_layoutFont),
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CodePointLayout::Builder('X', k_layoutFont),
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VerticalOffsetLayout::Builder(
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CodePointLayout::Builder('2', k_layoutFont),
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VerticalOffsetLayoutNode::Position::Superscript
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),
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CodePointLayout::Builder('+', k_layoutFont),
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CodePointLayout::Builder('b', k_layoutFont),
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CodePointLayout::Builder(UCodePointMiddleDot, k_layoutFont),
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CodePointLayout::Builder('X', k_layoutFont),
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CodePointLayout::Builder('+', k_layoutFont),
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CodePointLayout::Builder('c', k_layoutFont),
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});
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}
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return m_layout;
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}
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double QuadraticModel::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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return a*x*x+b*x+c;
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}
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double QuadraticModel::partialDerivate(double * modelCoefficients, int derivateCoefficientIndex, double x) const {
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if (derivateCoefficientIndex == 0) {
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// Derivate: x^2
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return x*x;
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}
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if (derivateCoefficientIndex == 1) {
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// Derivate: x
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return x;
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}
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if (derivateCoefficientIndex == 2) {
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// Derivate: 1
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return 1;
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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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Expression QuadraticModel::expression(double * modelCoefficients) {
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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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// a*x^2+b*x+c
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return Addition::Builder({
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Multiplication::Builder({
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Number::DecimalNumber(a),
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Power::Builder(
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Symbol::Builder('x'),
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Decimal::Builder(2.0)
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)
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}),
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Multiplication::Builder({
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Number::DecimalNumber(b),
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Symbol::Builder('x')
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}),
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Number::DecimalNumber(c)
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});
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}
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}
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