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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
// SPDX-FileCopyrightText: Copyright © DUNE Project contributors, see file AUTHORS.md
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception OR LGPL-3.0-or-later
#ifndef DUNE_FUNCTIONS_ANALYTICFUNCTIONS_TRIGONOMETRICFUNCTION_HH
#define DUNE_FUNCTIONS_ANALYTICFUNCTIONS_TRIGONOMETRICFUNCTION_HH
#include <cmath>
namespace Dune {
namespace Functions {
/**
* \brief A linear combination of trigonomic functions
*
* \ingroup FunctionImplementations
*
* \tparam K Scalar type. The polynomial will map K to K
* \tparam sinFactor Factor in front of sin
* \tparam cosFactor Factor in front of cos
*
* This class exists mainly to demonstrate how to implement
* the \ref Concept::DifferentiableFunction<Range(Domain), DerivativeTraits> concept.
*/
template<class K, int sinFactor, int cosFactor>
class TrigonometricFunction
{
public:
//! Evaluate function
K operator () (const K& x) const
{
return sinFactor * std::sin(x) + cosFactor * std::cos(x);
}
};
//! Obtain derivative of TrigonometricFunction function \ingroup FunctionImplementations
template<class K, int sinFactor, int cosFactor>
TrigonometricFunction<K, -cosFactor, sinFactor> derivative(const TrigonometricFunction<K, sinFactor, cosFactor>& f)
{
return TrigonometricFunction<K, -cosFactor, sinFactor>();
}
}} // namespace Dune::Functions
#endif // DUNE_FUNCTIONS_ANALYTICFUNCTIONS_TRIGONOMETRICFUNCTION_HH
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