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https://github.com/triqs/dft_tools
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165 lines
4.4 KiB
ReStructuredText
165 lines
4.4 KiB
ReStructuredText
.. highlight:: c
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.. _gf_block:
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block_gf<G> (alias of gf<block_index, G>)
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===================================================
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This is a specialisation of :ref:`gf_and_view` for block functions.
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A block Green function is nothing but Green function on a discrete domain representing the
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block indices, and whose value is a Green function itself.
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For convenience, for following aliases are provided ::
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template<typename ... T> using block_gf = gf <block_index, gf<T...>>;
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template<typename ... T> using block_gf_view = gf_view <block_index, gf<T...>>;
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template<typename ... T> using block_gf_const_view = gf_const_view<block_index, gf<T...>>;
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Constructors
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--------------
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The constructors of the gf.
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target_shape_t = {}
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Factories
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-------------
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Also several factories are provided for these block Green functions.
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Factories for the regular type
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.....................................
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The factories for the regular type *gf* are ::
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// From a number and a gf to be copied
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template <typename Variable, typename Target, typename Opt>
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block_gf<Variable, Target, Opt>
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make_block_gf(int n, gf<Variable, Target, Opt> const & g);
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// From a vector of gf (moving directly)
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template <typename Variable, typename Target, typename Opt>
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block_gf<Variable, Target, Opt>
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make_block_gf(std::vector<gf<Variable, Target, Opt>> V);
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// From a vector of gf or views (a gf must be contructible from GF2)
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template <typename Variable, typename Target, typename Opt, typename GF2>
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block_gf<Variable, Target, Opt>
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make_block_gf(std::vector<GF2> const &V);
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// From a init list of GF with the correct type
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template <typename Variable, typename Target, typename Opt>
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block_gf<Variable, Target, Opt>
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make_block_gf(std::initializer_list<gf<Variable, Target, Opt>> const &V);
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// From vector<string> and a gf to be copied
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template <typename Variable, typename Target, typename Opt>
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block_gf<Variable, Target, Opt>
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make_block_gf(std::vector<std::string> block_names, gf<Variable, Target, Opt> const &g);
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// From vector<string>, vector<gf>
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template <typename Variable, typename Target, typename Opt>
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block_gf<Variable, Target, Opt>
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make_block_gf(std::vector<std::string> block_names, std::vector<gf<Variable, Target, Opt>> V);
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// From vector<string>, init_list<GF>
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template <typename Variable, typename Target, typename Opt>
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block_gf<Variable, Target, Opt>
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make_block_gf(std::vector<std::string> block_names,
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std::initializer_list<gf<Variable, Target, Opt>> const &V);
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Factories for the view type
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.....................................
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The factories for the view type *gf_view*, *gf_const_view* are ::
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// Build a view of the gf.
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// 1- All Green functions must have the same type
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// 2- [Expert only] This is a simplified version of the code.
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// In the real code, the reference is of stripped from G in the type deduction.
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template<typename ... G>
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gf_view<block_index, G>
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make_block_gf_view(G && ... g);
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// Make a view from a vector of gf
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template<typename GF>
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gf_view<block_index,GF>
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make_block_gf_view_from_vector (std::vector<GF> V);
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Domain & mesh
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----------------
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The domain is a discrete domain ...
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Singularity
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-------------
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None.
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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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Not exposed to user.
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HDF5 storage convention
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---------------------------
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TO BE WRITTEN.
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Iterators
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-----------
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TO BE COMPLETED.
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Block gf have a natural iterator, e.g. ::
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// if a BG is block function
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for (auto & g : BG) ....
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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 =1;
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// Make a block gf of 3 gf, which are empty (default constructed).
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auto Bg0 = block_gf<imfreq> (3);
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// make a few gf<imfreq> ...
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auto g1 = gf<imfreq> ({beta, Fermion}, {2,2});
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// ... and construct some block function out of them.
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auto Bg1 = make_block_gf<imfreq> (3, g1);
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auto Bg2 = make_block_gf<imfreq> ({g1,g1,g1});
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auto Bg3 = make_block_gf<imfreq> ({"a","b","c"}, {g1,g1,g1});
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// do something on all blocks
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for (auto const &g : Bg1) {
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std::cout<< g.mesh() << std::endl;
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}
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// multiply them by 1,2,3 ...
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auto i = 1;
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for (auto & g : Bg1) g = g * i++;
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// a little save in an hdf5 file ?
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H5::H5File file("test_block_gf.h5", H5F_ACC_TRUNC );
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h5_write(file, "B3", Bg3);
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}
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