QuantumPackage/docs/source/users_guide/printing.rst

Printing the near-|FCI| wave function 
=====================================

Once obtained the near-|FCI| energy, one can also take a closer look at 
the wave function stored in the |EZFIO| database. If the wave function  
contains less than :math:`10^4` determinants, you can directly read it  
with the :ref:`qp_edit` command. Just run                               

.. code::

    qp_edit file.ezfio


.. important::

   The :ref:`qp_edit` mode virtually makes human-friendly the           
   architecture of the |EZFIO| database through the use of a
   the text editor defined by the :envvar:`EDITOR` environment
   variable.


Then, look for the word *hand* when you are in the :ref:`qp_edit`       
mode. If the research is negative, then it means that the wave          
function stored in the |EZFIO| database is too large to be edited       
interactively in :ref:`qp_edit` mode. An alternative is to use the      
:ref:`print_ci_vectors` program:                                            

.. code::

    qp_run print_ci_vectors file.ezfio > tee file.ezfio.wf

This program will, by default, print out the full set of determinants, whatever
the size of the wave function stored in the |EZFIO| directory. 

.. seealso:: 

    To get some additional information on the wave function, you can use
    the :ref:`print_wf` program.