LeastSquaresFitBase.h

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//* This file is part of the MOOSE framework
//* https://mooseframework.inl.gov
//*
//* All rights reserved, see COPYRIGHT for full restrictions
//* https://github.com/idaholab/moose/blob/master/COPYRIGHT
//*
//* Licensed under LGPL 2.1, please see LICENSE for details
//* https://www.gnu.org/licenses/lgpl-2.1.html

#pragma once

#include <vector>
#include <string>

#include "Moose.h"

class LeastSquaresFitBase
{
public:
  LeastSquaresFitBase();
  LeastSquaresFitBase(const std::vector<Real> & x, const std::vector<Real> & y);

  virtual ~LeastSquaresFitBase() = default;

  virtual void generate();

  virtual Real sample(Real x) = 0;

  unsigned int getSampleSize();

  const std::vector<Real> & getCoefficients();

  void setVariables(const std::vector<Real> & x, const std::vector<Real> & y);

protected:
  virtual void fillMatrix() = 0;

  void doLeastSquares();

  std::vector<Real> _x;
  std::vector<Real> _y;
  std::vector<Real> _matrix;
  std::vector<Real> _coeffs;
  unsigned int _num_coeff;
};