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[apps/regression] Use a new helper to compute linear regression coefficients

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This commit is contained in:
Ruben Dashyan
2019-05-28 18:55:58 +02:00
committed by Léa Saviot
parent 13c63f495c
commit ea4dd33826
5 changed files with 40 additions and 4 deletions
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6
apps/regression/model/exponential_model.cpp
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@@ -1,5 +1,6 @@
#include "exponential_model.h"
#include "../store.h"
#include "../linear_model_helper.h"
#include <math.h>
#include <assert.h>
#include <poincare/code_point_layout.h>
@@ -81,8 +82,9 @@ void ExponentialModel::fit(Store * store, int series, double * modelCoefficients
const double meanOfXY = sumOfXY / numberOfPoints;
const double variance = meanOfXX - meanOfX * meanOfX;
const double covariance = meanOfXY - meanOfX * meanOfY;
modelCoefficients[1] = covariance / variance;
modelCoefficients[0] = sign * exp(meanOfY - modelCoefficients[1] * meanOfX);
modelCoefficients[1] = LinearModelHelper::Slope(covariance, variance);
modelCoefficients[0] =
sign * exp(LinearModelHelper::YIntercept(meanOfY, meanOfX, modelCoefficients[1]));
}
double ExponentialModel::partialDerivate(double * modelCoefficients, int derivateCoefficientIndex, double x) const {