CostFuncLeastSquares.h

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2010 ISIS Rutherford Appleton Laboratory UKRI,
//   NScD Oak Ridge National Laboratory, European Spallation Source,
//   Institut Laue - Langevin & CSNS, Institute of High Energy Physics, CAS
// SPDX - License - Identifier: GPL - 3.0 +
#pragma once
 
//----------------------------------------------------------------------
// Includes
//----------------------------------------------------------------------
#include "MantidCurveFitting/CostFunctions/CostFuncFitting.h"
#include "MantidCurveFitting/EigenMatrix.h"
#include "MantidCurveFitting/EigenVector.h"
 
namespace Mantid {
namespace CurveFitting {
namespace CostFunctions {
class MANTID_CURVEFITTING_DLL CostFuncLeastSquares : public CostFuncFitting {
public:
  CostFuncLeastSquares();
 
  std::string name() const override { return "Least squares"; }
 
  std::string shortName() const override { return "Chi-sq"; };
 
protected:
  void calActiveCovarianceMatrix(EigenMatrix &covar, double epsrel = 1e-8) override;
 
  void addVal(API::FunctionDomain_sptr domain, API::FunctionValues_sptr values) const override;
  void addValDerivHessian(API::IFunction_sptr function, API::FunctionDomain_sptr domain,
                          API::FunctionValues_sptr values, bool evalDeriv = true,
                          bool evalHessian = true) const override;
 
  virtual std::vector<double> getFitWeights(API::FunctionValues_sptr values) const;
 
  double m_factor;
};
 
} // namespace CostFunctions
} // namespace CurveFitting
} // namespace Mantid