lammps/doc/src/Modify_kspace.rst

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Kspace styles
=============
Classes that compute long-range Coulombic interactions via K-space
representations (Ewald, PPPM) are derived from the KSpace class. New
styles can be created to add new K-space options to LAMMPS.
Ewald.cpp is an example of computing K-space interactions.
Here is a brief description of methods you define in your new derived
class. See kspace.h for details.
+---------------+------------------------------------------------+
| init | initialize the calculation before a run |
+---------------+------------------------------------------------+
| setup | computation before the first timestep of a run |
+---------------+------------------------------------------------+
| compute | every-timestep computation |
+---------------+------------------------------------------------+
| memory_usage | tally of memory usage |
+---------------+------------------------------------------------+