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Chebyshev.h
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Chebyshev.h
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#ifndef MANTID_CURVEFITTING_CHEBYSHEV_H_
#define MANTID_CURVEFITTING_CHEBYSHEV_H_
//----------------------------------------------------------------------
// Includes
//----------------------------------------------------------------------
#include "MantidCurveFitting/Functions/BackgroundFunction.h"
#include <valarray>
namespace Mantid {
namespace CurveFitting {
namespace Functions {
/**
Implements Chebyshev polynomial expansion.
Attributes: int n - the highest polynomial order.
Parameters: n+1 expansion coefficients \f$a_i\f$ as in expression:
\f$\sum_{i=0}^{n} a_i T_i(x)\f$
Uses the Clenshaw algorithm to evaluate the expansion.
@author Roman Tolchenov, Tessella inc
@date 14/05/2010
Copyright © 2007-8 ISIS Rutherford Appleton Laboratory, NScD Oak Ridge
National Laboratory & European Spallation Source
This file is part of Mantid.
Mantid is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
Mantid is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
File change history is stored at: <https://github.com/mantidproject/mantid>
Code Documentation is available at: <http://doxygen.mantidproject.org>
*/
class DLLExport Chebyshev : public BackgroundFunction {
public:
/// Constructor
Chebyshev();
/// overwrite IFunction base class methods
std::string name() const override { return "Chebyshev"; }
const std::string category() const override { return "Background"; }
void function1D(double *out, const double *xValues,
const size_t nData) const override;
void functionDeriv1D(API::Jacobian *out, const double *xValues,
const size_t nData) override;
/// Set a value to attribute attName
void setAttribute(const std::string &attName, const Attribute &) override;
private:
/// Polynomial order
int m_n;
/// Lower x boundary. The default is -1
double m_StartX;
/// Upper x boundary. The default is 1
double m_EndX;
/// Keep intermediate calculatons
mutable std::valarray<double> m_b;
};
typedef boost::shared_ptr<Chebyshev> Chebyshev_sptr;
} // namespace Functions
} // namespace CurveFitting
} // namespace Mantid
#endif /*MANTID_CURVEFITTING_CHEBYSHEV_H_*/