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https://github.com/triqs/dft_tools
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579368f24b
- lazy_fourier and co --> fourier - ex fourier --> make_gf_from_fourier to make a new gf - = fourier (g) works only iif lhs is a view, like scalar. - updated python (commented fourier method).
78 lines
3.1 KiB
C++
78 lines
3.1 KiB
C++
/*******************************************************************************
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*
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* TRIQS: a Toolbox for Research in Interacting Quantum Systems
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*
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* Copyright (C) 2011-2014 by M. Ferrero, O. Parcollet
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*
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* TRIQS is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* TRIQS. If not, see <http://www.gnu.org/licenses/>.
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*
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******************************************************************************/
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#ifndef TRIQS_GF_LOCAL_FOURIER_REAL_H
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#define TRIQS_GF_LOCAL_FOURIER_REAL_H
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#include "fourier_base.hpp"
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#include <triqs/gfs/refreq.hpp>
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#include <triqs/gfs/retime.hpp>
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namespace triqs { namespace gfs {
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template <typename Target, typename Opt, bool V, bool C>
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gf_keeper<tags::fourier, retime, Target> fourier(gf_impl<retime, Target, Opt, V, C> const& g) {
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return {g};
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}
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template <typename Target, typename Opt, bool V, bool C>
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gf_keeper<tags::fourier, refreq, Target> inverse_fourier(gf_impl<refreq, Target, Opt, V, C> const& g) {
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return {g};
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}
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void triqs_gf_view_assign_delegation(gf_view<refreq, scalar_valued> g, gf_keeper<tags::fourier, retime, scalar_valued> const& L);
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void triqs_gf_view_assign_delegation(gf_view<refreq, matrix_valued> g, gf_keeper<tags::fourier, retime, matrix_valued> const& L);
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void triqs_gf_view_assign_delegation(gf_view<retime, scalar_valued> g, gf_keeper<tags::fourier, refreq, scalar_valued> const& L);
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void triqs_gf_view_assign_delegation(gf_view<retime, matrix_valued> g, gf_keeper<tags::fourier, refreq, matrix_valued> const& L);
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template <typename Opt> gf_mesh<refreq, Opt> make_mesh_fourier_compatible(gf_mesh<retime, Opt> const& m) {
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int L = m.size();
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double pi = std::acos(-1);
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double wmin = -pi * (L - 1) / (L * m.delta());
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double wmax = pi * (L - 1) / (L * m.delta());
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return {wmin, wmax, L};
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}
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template <typename Opt>
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gf_mesh<retime, Opt> make_mesh_fourier_compatible(gf_mesh<refreq, Opt> const& m, mesh_kind mk = full_bins) {
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double pi = std::acos(-1);
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int L = m.size();
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double tmin = -pi * (L-1) / (L*m.delta());
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double tmax = pi * (L-1) / (L*m.delta());
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return {tmin, tmax, L};
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}
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template <typename Target, typename Opt, bool V, bool C>
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gf_view<refreq, Target> make_gf_from_fourier(gf_impl<retime, Target, Opt, V, C> const& gt) {
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auto gw = gf<refreq, Target>{make_mesh_fourier_compatible(gt.mesh()), get_target_shape(gt)};
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gw() = fourier(gt);
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return gw;
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}
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template <typename Target, typename Opt, bool V, bool C>
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gf_view<retime, Target> make_gf_from_inverse_fourier(gf_impl<refreq, Target, Opt, V, C> const& gw) {
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auto gt = gf<retime, Target>{make_mesh_fourier_compatible(gw.mesh()), get_target_shape(gw)};
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gt() = inverse_fourier(gw);
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return gt;
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}
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}}
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#endif
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