mirror of
https://github.com/triqs/dft_tools
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69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
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/*******************************************************************************
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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 by M. Ferrero, O. Parcollet, I. Krivenko
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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 grneral 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 grneral 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 grneral 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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#include "pade.hpp"
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#include <triqs/arrays.hpp>
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#include <triqs/utility/pade_approximants.hpp>
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namespace triqs { namespace gfs {
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typedef std::complex<double> dcomplex;
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void pade (gf_view<refreq> &gr, gf_view<imfreq> const &gw, int n_points, double freq_offset) {
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// make sure the GFs have the same structure
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//assert(gw.shape() == gr.shape());
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// copy the tail. it doesn't need to conform to the pade approximant
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gr.singularity() = gw.singularity();
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auto sh = gw.data().shape().front_pop();
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int N1 = sh[0], N2 = sh[1];
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for (int n1=0; n1<N1; n1++) {
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for (int n2=0; n2<N2; n2++) {
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arrays::vector<dcomplex> z_in(n_points); // complex points
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arrays::vector<dcomplex> u_in(n_points); // values at these points
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arrays::vector<dcomplex> a(n_points); // corresponding Pade coefficients
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for (int i=0; i < n_points; ++i) z_in(i) = gw.mesh()[i];
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for (int i=0; i < n_points; ++i) u_in(i) = gw.on_mesh(i)(n1,n2);
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triqs::utility::pade_approximant PA(z_in,u_in);
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gr() = 0.0;
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for (auto om : gr.mesh()) {
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dcomplex e = om + dcomplex(0.0,1.0)*freq_offset;
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gr[om](n1,n2) = PA(e);
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}
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}
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}
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}
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//gf_keeper<tags::pade,imfreq> lazy_pade(gf_view<imfreq> const & gw) {return gw;}
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//void triqs_gf_view_assign_delegation(gf_view<refreq> &gr, gf_keeper<tags::pade,imfreq> const & L) { pade(gr, L.g); }
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}}
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