.. index:: fix_modify AtC atom_element_map

fix_modify AtC atom_element_map command
=======================================

Syntax
""""""

.. code-block:: LAMMPS

   fix_modify <AtC fixID> atom_element_map <eulerian|lagrangian> [<frequency>]

* AtC fixID = ID of :doc:`fix atc <fix_atc>` instance
* atom_element_map = name of the AtC sub-command
* *eulerian* or *lagrangian* = frame of reference
* frequency = frequency of updating atom-to-continuum maps based on the current configuration - (only for eulerian)


Examples
""""""""

.. code-block:: LAMMPS

   fix_modify AtC atom_element_map eulerian 100

Description
"""""""""""

Changes frame of reference from *eulerian* to *lagrangian* or vice versa
and sets the frequency for which the map from atoms to elements is
reformed and all the attendant data is recalculated.

Restrictions
""""""""""""

Cannot change map type after initialization.

Related AtC commands
""""""""""""""""""""

- :ref:`fix_modify AtC command overview <atc_fix_modify>`

Default
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*lagrangian*
