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BackToBackExponential.h
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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 {
/**
Provide BackToBackExponential peak shape function interface to IPeakFunction.
That is the function:
I*(A*B/(A+B)/2)*(exp(A/2*(A*S^2+2*(x-X0)))*erfc((A*S^2+(x-X0))/sqrt(2*S^2))+exp(B/2*(B*S^2-2*(x-X0)))*erfc((B*S^2-(x-X0))/sqrt(2*S^2))).
Function parameters:
<UL>
<LI> I - Integrated intensity of peak (default 0.0)</LI>
<LI> A - exponential constant of rising part of neutron pulse (default 1.0)</LI>
<LI> B - exponential constant of decaying part of neutron pulse (default
0.05)</LI>
<LI> X0 - peak position (default 0.0)</LI>
<LI> S - standard deviation of gaussian part of peakshape function (default
1.0)</LI>
</UL>
@author Anders Markvardsen, ISIS, RAL
@date 9/11/2009
*/
class MANTID_CURVEFITTING_DLL BackToBackExponential
: public API::IPeakFunction {
public:
/// Default constructor.
BackToBackExponential() : API::IPeakFunction() {}
/// overwrite IPeakFunction base class methods
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"); }
void setIntensity(const double newIntensity) override {
setParameter("I", newIntensity);
}
/// overwrite IFunction base class methods
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:
/// overwrite IFunction base class method, which declare function parameters
void init() override;
/// Function evaluation method to be implemented in the inherited classes
void functionLocal(double *, const double *, const size_t) const override {}
/// Derivative evaluation method to be implemented in the inherited classes
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