fix_gyration.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 gyration command
	</H3>
	<P><B>Syntax:</B>
	</P>
	<PRE>fix ID group-ID gyration N file
	</PRE>
	<UL><LI>ID, group-ID are documented in <A HREF = "fix.html">fix</A> command
	<LI>gyration = style name of this fix command
	<LI>N = compute radius-of-gyration every this many timesteps
	<LI>file = filename to write gyration info to
	</UL>
	<P><B>Examples:</B>
	</P>
	<PRE>fix 1 all gyration 100 molecule.out
	</PRE>
	<P><B>Description:</B>
	</P>
	<P>Compute the radius-of-gyration 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>Rg is a measure of the size of the group of atoms, and is computed by
	this formula
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	<CENTER><IMG SRC = "Eqs/fix_gyration.jpg">
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	<P>where M is the total mass of the group and Rcm is the center-of-mass
	position of the group.
	</P>
	<P><B>Restrictions:</B> none
	</P>
	<P><B>Related commands:</B> none
	</P>
	<P><B>Default:</B> none
	</P>
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