mirror of
https://github.com/triqs/dft_tools
synced 2024-11-01 11:43:47 +01:00
fa07abbea9
- change the underlying data : do not flatten the linear indices of the mesh into a single index, keep a higher dim array. - easier for various places, and necessary for g(nu,nu'). - work on several 2 part. containers. - add default target (may not be always matrix_valued)
108 lines
3.6 KiB
C++
108 lines
3.6 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) 2012-2013 by 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 "./tools.hpp"
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#include "./gf.hpp"
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#include "./local/tail.hpp"
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#include "./local/no_tail.hpp"
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#include "./domains/matsubara.hpp"
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#include "./meshes/matsubara_time.hpp"
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#include "./evaluators.hpp"
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namespace triqs {
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namespace gfs {
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struct imtime {};
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template <typename Opt> struct gf_mesh<imtime, Opt> : matsubara_time_mesh {
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template <typename... T> gf_mesh(T &&... x) : matsubara_time_mesh(std::forward<T>(x)...) {}
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// using matsubara_time_mesh::matsubara_time_mesh;
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};
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// singularity
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template <> struct gf_default_singularity<imtime, matrix_valued> {
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using type = local::tail;
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};
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template <> struct gf_default_singularity<imtime, scalar_valued> {
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using type = local::tail;
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};
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namespace gfs_implementation {
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// h5 name
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template <typename Singularity, typename Opt> struct h5_name<imtime, matrix_valued, Singularity, Opt> {
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static std::string invoke() { return "ImTime"; }
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};
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/// --------------------------- data access ---------------------------------
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template <typename Opt> struct data_proxy<imtime, matrix_valued, Opt> : data_proxy_array<double, 3> {};
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template <typename Opt> struct data_proxy<imtime, scalar_valued, Opt> : data_proxy_array<double, 1> {};
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/// --------------------------- closest mesh point on the grid ---------------------------------
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template <typename Singularity, typename Opt, typename Target> struct get_closest_point<imtime, Target, Singularity, Opt> {
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// index_t is int
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template <typename G, typename T> static int invoke(G const *g, closest_pt_wrap<T> const &p) {
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double x = (g->mesh().kind() == half_bins ? double(p.value) : double(p.value) + 0.5 * g->mesh().delta());
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int n = std::floor(x / g->mesh().delta());
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return n;
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}
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};
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/// --------------------------- evaluator ---------------------------------
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// this one is specific because of the beta-antiperiodicity for fermions
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template <> struct evaluator_fnt_on_mesh<imtime> {
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double w1, w2;
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long n;
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evaluator_fnt_on_mesh() = default;
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evaluator_fnt_on_mesh(gf_mesh<imtime> const &m, double tau) {
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double beta = m.domain().beta;
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int p = std::floor(tau / beta);
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tau -= p * beta;
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double w;
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bool in;
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std::tie(in, n, w) = windowing(m, tau);
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if (!in) TRIQS_RUNTIME_ERROR << " Evaluation out of bounds";
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if ((m.domain().statistic == Fermion) && (p % 2 != 0)) {
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w2 = -w;
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w1 = w - 1;
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} else {
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w2 = w;
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w1 = 1 - w;
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}
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}
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template <typename F> auto operator()(F const &f) const DECL_AND_RETURN(w1 *f(n) + w2 *f(n + 1));
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};
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// now evaluator
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template <typename Singularity, typename Opt, typename Target>
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struct evaluator<imtime, Target, Singularity, Opt> : evaluator_one_var<imtime> {};
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} // gfs_implementation.
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}
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}
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