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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 ::
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qp_edit file.ezfio
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.. important ::
The :ref: `qp_edit` mode virtually makes human-friendly the architecture of the |EZFIO| database
through *vim* -like editor.
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 :command: `print_wf` command:
.. code ::
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qp_run print_wf file.ezfio | tee file.ezfio.fci_natorb.wf
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This program will, by default, print out the first :math: `10^4` determinants whatever the size of the wave function stored in the |EZFIO| folder. If you want to change the number of printed Slater determinants, just change the :option: `determinants n_det_print_wf` keyword using the :ref: `qp_edit` tool.
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.. seealso ::
The documentation of the :ref: `print_wf` program.
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