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[apps/regression] Fix wrong proportional model fit

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This commit is contained in:
Léa Saviot
2020-07-02 16:23:09 +02:00
parent 5dfccd4a04
commit 6b60fc561f
3 changed files with 8 additions and 5 deletions
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4
apps/regression/model/proportional_model.cpp
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@@ -27,10 +27,6 @@ double ProportionalModel::levelSet(double * modelCoefficients, double xMin, doub
return y/a;
}
void ProportionalModel::fit(Store * store, int series, double * modelCoefficients, Poincare::Context * context) {
modelCoefficients[0] = store->slope(series);
}
double ProportionalModel::partialDerivate(double * modelCoefficients, int derivateCoefficientIndex, double x) const {
assert(derivateCoefficientIndex == 0);
// Derivate: x

1
apps/regression/model/proportional_model.h
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@@ -12,7 +12,6 @@ public:
I18n::Message formulaMessage() const override { return I18n::Message::ProportionalRegressionFormula; }
double evaluate(double * modelCoefficients, double x) const override;
double levelSet(double * modelCoefficients, double xMin, double step, double xMax, double y, Poincare::Context * context) override;
void fit(Store * store, int series, double * modelCoefficients, Poincare::Context * context) override;
double partialDerivate(double * modelCoefficients, int derivateCoefficientIndex, double x) const override;
int numberOfCoefficients() const override { return 1; }
int bannerLinesCount() const override { return 2; }

8
apps/regression/test/model.cpp
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@@ -50,6 +50,14 @@ QUIZ_CASE(proportional_regression) {
assert_regression_is(x, y, 5, Model::Type::Proportional, coefficients);
}
QUIZ_CASE(proportional_regression2) {
constexpr int numberOfPoints = 4;
double x[numberOfPoints] = {5.0, 2.0, 3.0, 4.0};
double y[numberOfPoints] = {10.0, 6.0, 7.0, 8.0};
double coefficients[] = {2.12963963};
assert_regression_is(x, y, numberOfPoints, Model::Type::Proportional, coefficients);
}
QUIZ_CASE(quadratic_regression) {
double x[] = {-34.0, -12.0, 5.0, 86.0, -2.0};
double y[] = {-8241.389, -1194.734, -59.163, - 46245.39, -71.774};