AsymmetricPearsonVII.h

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2022 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 "MantidAPI/IPeakFunction.h"
#include "MantidCurveFitting/DllConfig.h"
 
namespace Mantid {
namespace CurveFitting {
namespace Functions {
 
class MANTID_CURVEFITTING_DLL AsymmetricPearsonVII : public API::IPeakFunction {
public:
  AsymmetricPearsonVII();
 
  double height() const override;
  double centre() const override;
  double fwhm() const override;
  double leftShape() const;
  double rightShape() const;
 
  void setCentre(const double newCentre) override;
  void setHeight(const double newHight) override;
  void setFwhm(const double newFwhm) override;
  void setLeftShape(const double newLeftShape);
  void setRightShape(const double newRightShape);
 
  std::string name() const override { return "AsymmetricPearsonVII"; }
  const std::string category() const override { return "XrayDiffraction"; }
 
  double activeParameter(size_t i) const override;
  void setActiveParameter(size_t i, double value) override;
 
  double getPearsonVII(double peak_height, double offset, double weight, double m) const;
  double getPearsonVIIDerivWRTh(double offset, double weight, double m) const;
  double getPearsonVIIDerivWRTc(double peak_height, double offset, double weight, double m) const;
  double getPearsonVIIDerivWRTw(double peak_height, double offset, double weight, double m) const;
  double getPearsonVIIDerivWRTm(double peak_height, double offset, double weight, double m) const;
 
  double getPearsonVIILimitmEq0(double peak_height) const;
  double getPearsonVIIDerivWRThLimitmEq0() const;
  double getPearsonVIIDerivWRTcLimitmEq0() const;
  double getPearsonVIIDerivWRTwLimitmEq0() const;
  double getPearsonVIIDerivWRTmLimitmEq0(double peak_height, double offset, double weight) const;
 
protected:
  void functionLocal(double *out, const double *xValues, const size_t nData) const override;
  void functionDerivLocal(API::Jacobian *out, const double *xValues, const size_t nData) override;
  void init() override;
};
 
double denominator_function(double offset_sq, double weight_sq, double m);
double derivative_function(double peak_height, double offset, double weight, double m);
double m_derivative_function(double peak_height, double offset_sq, double weight_sq, double m);
 
} // namespace Functions
} // namespace CurveFitting
} // namespace Mantid