SimpleChebfun.h

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2015 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
 
#include "MantidCurveFitting/Functions/ChebfunBase.h"
#include "MantidKernel/System.h"
 
namespace Mantid {
namespace CurveFitting {
namespace Functions {
 
class MANTID_CURVEFITTING_DLL SimpleChebfun {
public:
  SimpleChebfun(size_t n, ChebfunFunctionType fun, double start, double end);
  SimpleChebfun(size_t n, const API::IFunction &fun, double start, double end);
  SimpleChebfun(const ChebfunFunctionType &fun, double start, double end, double accuracy = 0.0, size_t badSize = 10);
  SimpleChebfun(const API::IFunction &fun, double start, double end, double accuracy = 0.0, size_t badSize = 10);
  SimpleChebfun(const std::vector<double> &x, const std::vector<double> &y);
  size_t size() const { return m_base->size(); }
  size_t order() const { return m_base->order(); }
  bool isGood() const { return !m_badFit; }
  double startX() const { return m_base->startX(); }
  double endX() const { return m_base->endX(); }
  double width() const { return m_base->width(); }
  const std::vector<double> &xPoints() const { return m_base->xPoints(); }
  const std::vector<double> &yPoints() const { return m_P; }
  const std::vector<double> &coeffs() const;
  double operator()(double x) const;
  std::vector<double> operator()(const std::vector<double> &x) const;
  std::vector<double> linspace(size_t n) const;
  double accuracy() const;
  SimpleChebfun derivative() const;
  SimpleChebfun integral() const;
  std::vector<double> roughRoots(double level = 0.0) const;
  double integrate() const;
  SimpleChebfun &operator+=(const ChebfunFunctionType &fun);
 
private:
  SimpleChebfun(const ChebfunBase_sptr &base);
  ChebfunBase_sptr m_base;
  std::vector<double> m_P;
  mutable std::vector<double> m_A;
 
  bool m_badFit;
};
 
} // namespace Functions
} // namespace CurveFitting
} // namespace Mantid