mirror of
https://github.com/triqs/dft_tools
synced 2024-11-01 19:53:45 +01:00
0a1285405c
- Add Fourier for lattice. - Add regular_bz_mesh, cyclic_lattice, and their FFT. - rm freq_infty. - The gf can now be evaluated on a tail_view, which result in composing the tail. - Fix the following issue : g(om_) << g(om_ +1) will recompose the tail correctly. - TODO : TEST THIS NEW FEATURE IN DETAIL. - Work on singularity for G(x, omega) - Separate the factory for singularity from the data factory in gf. - overload assign_from_functoin (renamed). - Fix singularity_t and co in the gf (const issue). - Clean tail, add tail_const_view - add m_tail for x -> tail on any mesh - test curry + fourier works on k
74 lines
2.9 KiB
C++
74 lines
2.9 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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#pragma once
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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 Singularity, typename Opt, bool V, bool C>
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gf_keeper<tags::fourier, retime, Target, Singularity> fourier(gf_impl<retime, Target, Singularity, Opt, V, C> const& g) {
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return {g};
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}
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template <typename Target, typename Singularity, typename Opt, bool V, bool C>
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gf_keeper<tags::fourier, refreq, Target, Singularity> inverse_fourier(gf_impl<refreq, Target, Singularity, Opt, V, C> const& g) {
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return {g};
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}
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void _fourier_impl(gf_view<refreq, scalar_valued> gw, gf_const_view<retime, scalar_valued> gt);
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void _fourier_impl(gf_view<retime, scalar_valued> gt, gf_const_view<refreq, scalar_valued> gw);
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// helper functions
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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 Singularity, typename Opt, bool V, bool C>
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gf_view<refreq, Target> make_gf_from_fourier(gf_impl<retime, Target, Singularity, 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 Singularity, typename Opt, bool V, bool C>
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gf_view<retime, Target> make_gf_from_inverse_fourier(gf_impl<refreq, Target, Singularity, 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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