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https://github.com/triqs/dft_tools
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82 lines
1.6 KiB
ReStructuredText
82 lines
1.6 KiB
ReStructuredText
.. highlight:: c
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.. _gf_imfreq:
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gf<imfreq>
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==========================================================
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This is a specialisation of :ref:`gf_and_view` for imaginary Matsubara frequencies.
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Domain & mesh
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----------------
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Singularity
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-------------
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:ref:`gf_tail`.
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Factories
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-------------
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The factories are ::
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make_gf(gf_mesh<imfreq,Opt> m, matrix_shape_t shape, local::tail_view t = local::tail(shape) )
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make_gf(double beta, statistic_enum S, matrix_shape_t shape, size_t Nmax = 1025, local::tail_view t = local::tail(shape) )
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Interpolation method
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---------------------
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None
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Data storage
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---------------
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* `data_t` : 3d array (C ordered) of complex<double>.
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* g.data()(i, range(), range()) is the value of g for the i-th point of the mesh.
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HDF5 storage convention
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---------------------------
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h5 tag : `ImFreq`
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Examples
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---------
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.. compileblock::
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#include <triqs/gfs/imfreq.hpp>
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using namespace triqs::gfs;
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int main() {
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double beta=1; // inverse temperature
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size_t n_freq=5; // we will have 5 points including iw=0 and iw=beta
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auto GF = make_gf<imfreq>(beta, Fermion, make_shape(1,1), n_freq);
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};
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An alternative declaration with an explicit construction of the underlying mesh:
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.. compileblock::
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#include <triqs/gfs/imfreq.hpp>
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using namespace triqs::gfs;
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int main(){
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double beta=10;
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int Nfreq =100;
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auto GF = make_gf<imfreq>(gf_mesh<imfreq>{beta,Fermion,Nfreq}, make_shape(1,1), local::tail(1,1));
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// or even simpler
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auto GF2 = make_gf<imfreq>({beta,Fermion,Nfreq}, make_shape(1,1), local::tail(1,1));
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}
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