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muSpectre/src/fft/projection_default.cc
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projection_default.cc
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/**
* @file projection_default.cc
*
* @author Till Junge <till.junge@altermail.ch>
*
* @date 14 Jan 2018
*
* @brief Implementation default projection implementation
*
* Copyright © 2018 Till Junge
*
* µSpectre 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, or (at
* your option) any later version.
*
* µSpectre 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 GNU Emacs; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "fft/projection_default.hh"
#include "fft/fft_engine_base.hh"
namespace muSpectre {
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
ProjectionDefault<DimS, DimM>::ProjectionDefault(FFTEngine_ptr engine,
Rcoord lengths,
Formulation form)
:Parent{std::move(engine), lengths, form},
Gfield{make_field<Proj_t>("Projection Operator",
this->projection_container)},
Ghat{Gfield}
{}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
void ProjectionDefault<DimS, DimM>::apply_projection(Field_t & field) {
Vector_map field_map{this->fft_engine->fft(field)};
Real factor = this->fft_engine->normalisation();
for (auto && tup: akantu::zip(this->Ghat, field_map)) {
auto & G{std::get<0>(tup)};
auto & f{std::get<1>(tup)};
f = factor * (G*f).eval();
}
this->fft_engine->ifft(field);
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
Eigen::Map<Eigen::ArrayXXd> ProjectionDefault<DimS, DimM>::get_operator() {
return this->Gfield.dyn_eigen();
}
template class ProjectionDefault<twoD, twoD>;
template class ProjectionDefault<threeD, threeD>;
} // muSpectre
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