fix_com.html
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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>Restrictions:</B> none
			</P>
			<P><B>Related commands:</B> none
			</P>
			<P><B>Default:</B> none
			</P>
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