8df6f6ec12
like in LINEST implementation in Calc. Use a straightforward regression solver in this case, so that it is easier to handle the numerical error in the intercept term using ::rtl::math::approxSub(). Change-Id: I627c0c48e377cac5385a85050c4f472ee963f3d6 Reviewed-on: https://gerrit.libreoffice.org/85222 Tested-by: Jenkins Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
64 lines
2.3 KiB
C++
64 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#ifndef INCLUDED_CHART2_SOURCE_INC_POLYNOMIALREGRESSIONCURVECALCULATOR_HXX
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#define INCLUDED_CHART2_SOURCE_INC_POLYNOMIALREGRESSIONCURVECALCULATOR_HXX
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#include "RegressionCurveCalculator.hxx"
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#include <vector>
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namespace RegressionCalculationHelper
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{
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typedef std::pair< std::vector< double >, std::vector< double > > tDoubleVectorPair;
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}
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namespace chart
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{
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class PolynomialRegressionCurveCalculator : public RegressionCurveCalculator
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{
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public:
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PolynomialRegressionCurveCalculator();
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virtual ~PolynomialRegressionCurveCalculator() override;
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protected:
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virtual OUString ImplGetRepresentation(
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const css::uno::Reference<css::util::XNumberFormatter>& xNumFormatter,
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sal_Int32 nNumberFormatKey, sal_Int32* pFormulaMaxWidth = nullptr ) const override;
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virtual double SAL_CALL getCurveValue( double x ) override;
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private:
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// ____ XRegressionCurveCalculator ____
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virtual void SAL_CALL recalculateRegression(
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const css::uno::Sequence<double>& aXValues,
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const css::uno::Sequence<double>& aYValues ) override;
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void computeCorrelationCoefficient(
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RegressionCalculationHelper::tDoubleVectorPair& rValues,
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const sal_Int32 aNoValues,
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double yAverage );
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std::vector<double> mCoefficients;
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};
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} // namespace chart
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#endif // INCLUDED_CHART2_SOURCE_INC_POLYNOMIALREGRESSIONCURVECALCULATOR_HXX
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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