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Gaussian.h
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Gaussian.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"
#include <cmath>
namespace Mantid {
namespace CurveFitting {
namespace Functions {
/**
Provide gaussian peak shape function interface to IPeakFunction.
I.e. the function: Height*exp(-0.5*((x-PeakCentre)/Sigma)^2).
This function actually performs the fitting on 1/Sigma^2 rather than Sigma
for stability reasons.
Gauassian parameters:
<UL>
<LI> Height - height of peak (default 0.0)</LI>
<LI> PeakCentre - centre of peak (default 0.0)</LI>
<LI> Sigma - standard deviation (default 0.0)</LI>
</UL>
@author Anders Markvardsen, ISIS, RAL
@date 19/10/2009
*/
class MANTID_CURVEFITTING_DLL Gaussian : public API::IPeakFunction {
public:
Gaussian();
/// overwrite IPeakFunction base class methods
double centre() const override;
double height() const override;
double fwhm() const override;
double intensity() const override;
double intensityError() const override;
void setCentre(const double c) override;
void setHeight(const double h) override;
void setFwhm(const double w) override;
void setIntensity(const double i) override;
void fixCentre(bool isDefault = false) override;
void unfixCentre() override;
void fixIntensity(bool isDefault = false) override;
void unfixIntensity() override;
/// overwrite IFunction base class methods
std::string name() const override { return "Gaussian"; }
const std::string category() const override { return "Peak; Muon\\MuonModelling"; }
void setActiveParameter(size_t i, double value) override;
double activeParameter(size_t i) const override;
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;
/// overwrite IFunction base class method, which declare function parameters
void init() override;
/// Calculate histogram data.
void histogram1D(double *out, double left, const double *right, const size_t nBins) const override;
/// Devivatives of the histogram.
void histogramDerivative1D(API::Jacobian *jacobian, double left, const double *right,
const size_t nBins) const override;
/// Intensity cache to help recover form Sigma==0 situation
mutable double m_intensityCache;
};
} // namespace Functions
} // namespace CurveFitting
} // namespace Mantid