mirror of
https://github.com/triqs/dft_tools
synced 2024-11-01 11:43:47 +01:00
24 lines
974 B
C++
24 lines
974 B
C++
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#include <triqs/gfs.hpp>
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#include <triqs/gfs/local/fit_tail.hpp>
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using namespace triqs::gfs;
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int main() {
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triqs::clef::placeholder<0> iom_;
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double beta = 10;
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int N = 100;
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auto gw = gf<imfreq>{{beta, Fermion, N}, {1, 1}};
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gw(iom_) << 1 / (iom_ - 1);
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size_t n_min = 50; // linear index on mesh to start the fit
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size_t n_max = 90; // final linear index for fit (included)
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int n_moments = 4; // number of moments in the final tail (including known ones)
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int size = 1; // means that we know one moment
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int order_min = 1; // means that the first moment in the final tail will be the first moment
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auto known_moments = local::tail(make_shape(1, 1), size, order_min); // length is 0, first moment to fit is order_min
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known_moments(1) = 1.; // set the first moment
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set_tail_from_fit(gw, known_moments, n_moments, n_min, n_max,
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true); // true replace the gf data in the fitting range by the tail values
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std::cout << gw.singularity() << std::endl;
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}
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