fix_com.html
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	<CENTER><A HREF = "http://lammps.sandia.gov">LAMMPS WWW Site</A> - <A HREF = "Manual.html">LAMMPS Documentation</A> - <A HREF = "Section_commands.html#comm">LAMMPS Commands</A>
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	<H3>fix com command
	</H3>
	<P><B>Syntax:</B>
	</P>
	<PRE>fix ID group-ID com N file
	</PRE>
	<UL><LI>ID, group-ID are documented in <A HREF = "fix.html">fix</A> command
	<LI>com = style name of this fix command
	<LI>N = compute center-of-mass every this many timesteps
	<LI>file = filename to write center-of-mass info to
	</UL>
	<P><B>Examples:</B>
	</P>
	<PRE>fix 1 all com 100 com.out
	</PRE>
	<P><B>Description:</B>
	</P>
	<P>Compute the center-of-mass of the group of atoms every N steps,
	including all effects due to atoms passing thru periodic boundaries.
	Write the results to the specified file.
	</P>
	<P><B>Restart, fix_modify, output, run start/stop, minimize info:</B>
	</P>
	<P>No information about this fix is written to <A HREF = "restart.html">binary restart
	files</A>. None of the <A HREF = "fix_modify.html">fix_modify</A> options
	are relevant to this fix. No global scalar or vector or per-atom
	quantities are stored by this fix for access by various <A HREF = "Section_howto.html#4_15">output
	commands</A>. No parameter of this fix can be
	used with the <I>start/stop</I> keywords of the <A HREF = "run.html">run</A> command.
	This fix is not invoked during <A HREF = "minimize.html">energy minimization</A>.
	</P>
	<P><B>Restrictions:</B> none
	</P>
	<P><B>Related commands:</B> none
	</P>
	<P><B>Default:</B> none
	</P>
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