// Copyright Nick Thompson, 2019
|
// Use, modification and distribution are subject to the
|
// Boost Software License, Version 1.0.
|
// (See accompanying file LICENSE_1_0.txt
|
// or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
/*
|
* References:
|
* Ooura, Takuya, and Masatake Mori. "A robust double exponential formula for Fourier-type integrals." Journal of computational and applied mathematics 112.1-2 (1999): 229-241.
|
* http://www.kurims.kyoto-u.ac.jp/~ooura/intde.html
|
*/
|
#ifndef BOOST_MATH_QUADRATURE_OOURA_FOURIER_INTEGRALS_HPP
|
#define BOOST_MATH_QUADRATURE_OOURA_FOURIER_INTEGRALS_HPP
|
#include <memory>
|
#include <boost/math/quadrature/detail/ooura_fourier_integrals_detail.hpp>
|
|
namespace boost { namespace math { namespace quadrature {
|
|
template<class Real>
|
class ooura_fourier_sin {
|
public:
|
ooura_fourier_sin(const Real relative_error_tolerance = tools::root_epsilon<Real>(), size_t levels = sizeof(Real)) : impl_(std::make_shared<detail::ooura_fourier_sin_detail<Real>>(relative_error_tolerance, levels))
|
{}
|
|
template<class F>
|
std::pair<Real, Real> integrate(F const & f, Real omega) {
|
return impl_->integrate(f, omega);
|
}
|
|
// These are just for debugging/unit tests:
|
std::vector<std::vector<Real>> const & big_nodes() const {
|
return impl_->big_nodes();
|
}
|
|
std::vector<std::vector<Real>> const & weights_for_big_nodes() const {
|
return impl_->weights_for_big_nodes();
|
}
|
|
std::vector<std::vector<Real>> const & little_nodes() const {
|
return impl_->little_nodes();
|
}
|
|
std::vector<std::vector<Real>> const & weights_for_little_nodes() const {
|
return impl_->weights_for_little_nodes();
|
}
|
|
private:
|
std::shared_ptr<detail::ooura_fourier_sin_detail<Real>> impl_;
|
};
|
|
|
template<class Real>
|
class ooura_fourier_cos {
|
public:
|
ooura_fourier_cos(const Real relative_error_tolerance = tools::root_epsilon<Real>(), size_t levels = sizeof(Real)) : impl_(std::make_shared<detail::ooura_fourier_cos_detail<Real>>(relative_error_tolerance, levels))
|
{}
|
|
template<class F>
|
std::pair<Real, Real> integrate(F const & f, Real omega) {
|
return impl_->integrate(f, omega);
|
}
|
private:
|
std::shared_ptr<detail::ooura_fourier_cos_detail<Real>> impl_;
|
};
|
|
|
}}}
|
#endif
|
