mirror of
https://github.com/triqs/dft_tools
synced 2024-12-26 22:33:48 +01:00
69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
|
|
/*******************************************************************************
|
|
*
|
|
* TRIQS: a Toolbox for Research in Interacting Quantum Systems
|
|
*
|
|
* Copyright (C) 2012 by M. Ferrero, O. Parcollet, I. Krivenko
|
|
*
|
|
* TRIQS is free software: you can redistribute it and/or modify it under the
|
|
* terms of the GNU grneral Public License as published by the Free Software
|
|
* Foundation, either version 3 of the License, or (at your option) any later
|
|
* version.
|
|
*
|
|
* TRIQS 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 grneral Public License for more
|
|
* details.
|
|
*
|
|
* You should have received a copy of the GNU grneral Public License along with
|
|
* TRIQS. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
******************************************************************************/
|
|
|
|
#include "pade.hpp"
|
|
#include <triqs/arrays.hpp>
|
|
#include <triqs/utility/pade_approximants.hpp>
|
|
|
|
namespace triqs { namespace gfs {
|
|
|
|
typedef std::complex<double> dcomplex;
|
|
|
|
void pade (gf_view<refreq> &gr, gf_view<imfreq> const &gw, int n_points, double freq_offset) {
|
|
|
|
// make sure the GFs have the same structure
|
|
//assert(gw.shape() == gr.shape());
|
|
|
|
// copy the tail. it doesn't need to conform to the pade approximant
|
|
gr.singularity() = gw.singularity();
|
|
|
|
auto sh = gw.data().shape().front_pop();
|
|
int N1 = sh[0], N2 = sh[1];
|
|
for (int n1=0; n1<N1; n1++) {
|
|
for (int n2=0; n2<N2; n2++) {
|
|
|
|
arrays::vector<dcomplex> z_in(n_points); // complex points
|
|
arrays::vector<dcomplex> u_in(n_points); // values at these points
|
|
arrays::vector<dcomplex> a(n_points); // corresponding Pade coefficients
|
|
|
|
for (int i=0; i < n_points; ++i) z_in(i) = gw.mesh()[i];
|
|
for (int i=0; i < n_points; ++i) u_in(i) = gw.on_mesh(i)(n1,n2);
|
|
|
|
triqs::utility::pade_approximant PA(z_in,u_in);
|
|
|
|
gr() = 0.0;
|
|
for (auto om : gr.mesh()) {
|
|
dcomplex e = om + dcomplex(0.0,1.0)*freq_offset;
|
|
gr[om](n1,n2) = PA(e);
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
//gf_keeper<tags::pade,imfreq> lazy_pade(gf_view<imfreq> const & gw) {return gw;}
|
|
|
|
//void triqs_gf_view_assign_delegation(gf_view<refreq> &gr, gf_keeper<tags::pade,imfreq> const & L) { pade(gr, L.g); }
|
|
|
|
}}
|