BackToBackExponential.h

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2007 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 "MantidAPI/IPeakFunction.h"
#include "MantidCurveFitting/DllConfig.h"
 
namespace Mantid {
namespace CurveFitting {
namespace Functions {
class MANTID_CURVEFITTING_DLL BackToBackExponential : public API::IPeakFunction {
public:
  BackToBackExponential() : API::IPeakFunction() {}
 
  double centre() const override { return getParameter("X0"); }
  void setCentre(const double c) override { setParameter("X0", c); }
  double height() const override;
  void setHeight(const double h) override;
  double fwhm() const override;
  void setFwhm(const double w) override;
  double intensity() const override { return getParameter("I"); }
  double intensityError() const override { return getError("I"); }
  void setIntensity(const double newIntensity) override { setParameter("I", newIntensity); }
  std::string getWidthParameterName() const override { return "S"; }
 
  std::string name() const override { return "BackToBackExponential"; }
  const std::string category() const override { return "Peak"; }
  void function1D(double *out, const double *xValues, const size_t nData) const override;
  void functionDeriv1D(API::Jacobian *jacobian, const double *xValues, const size_t nData) override;
 
protected:
  void init() override;
  void functionLocal(double *, const double *, const size_t) const override {}
  void functionDerivLocal(API::Jacobian *, const double *, const size_t) override {}
  double expWidth() const;
};
 
using BackToBackExponential_sptr = std::shared_ptr<BackToBackExponential>;
 
} // namespace Functions
} // namespace CurveFitting
} // namespace Mantid