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https://github.com/triqs/dft_tools
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62 lines
1.2 KiB
ReStructuredText
62 lines
1.2 KiB
ReStructuredText
.. highlight:: c
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.. _gf_imtime:
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gf<imtime>
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===================================================
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This is a specialisation of :ref:`gf_and_view` for imaginary Matsubara time.
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Domain & mesh
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----------------
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Singularity
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-------------
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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 : `ImTime`
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Examples
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---------
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.. compileblock::
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#include <triqs/gfs.hpp>
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using namespace triqs::gfs; using triqs::clef::placeholder;
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int main(){
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double beta=10, a = 1;
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int n_times=5;
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// First give information to build the mesh, second to build the target
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auto GF1 = gf<imtime> { {beta,Fermion,n_times}, {1,1} };
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// or a more verbose/explicit form ...
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auto GF2 = gf<imtime> { gf_mesh<imtime>{beta,Fermion,n_times}, make_shape(1,1) };
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// Filling the gf with something...
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placeholder<0> tau_;
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//GF1(tau_) << exp ( - a * tau_) / (1 + exp(- beta * a));
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// evaluation at n=3
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std::cout << make_matrix(GF1(3)) << " == "<< exp ( - a * 3) / (1 + exp(- beta * a)) << std::endl;
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}
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