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.. role:: green
.. role:: param


.. _triqs__atom_diag__atom_diag__get_matrix_element_of_monomial:

triqs::atom_diag::atom_diag::get_matrix_element_of_monomial
===========================================================

*#include <triqs/atom_diag/atom_diag.hpp>*



**Synopsis**

 .. rst-class:: cppsynopsis

       | std::pair<int, matrix_t> :red:`get_matrix_element_of_monomial` (operators::monomial_t const & :param:`op_vec`, int :param:`B`) const





Get matrix representation for a monomial operator





Parameters
^^^^^^^^^^

 * :param:`op_vec` A product of canonical operators operators (a monomial)

 * :param:`B` Initial subspace B


Returns
^^^^^^^

Index of the subspace connected from by :ref:`op_vec` from :ref:`B` and the corresponding matrix (not necessarily square)