fix_freeze.html
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fix_freeze.html
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			<H3>fix freeze command
			</H3>
			<P><B>Syntax:</B>
			</P>
			<PRE>fix ID group-ID freeze
			</PRE>
			<UL><LI>ID, group-ID are documented in <A HREF = "fix.html">fix</A> command
			<LI>freeze = style name of this fix command
			</UL>
			<P><B>Examples:</B>
			</P>
			<PRE>fix 2 bottom freeze
			</PRE>
			<P><B>Description:</B>
			</P>
			<P>Zero out the force and torque on a granular particle. This is useful
			for preventing certain particles from moving in a simulation.
			</P>
			<P><B>Restrictions:</B>
			</P>
			<P>Can only be used if LAMMPS was built with the "granular" package.
			</P>
			<P>There can only be a single freeze fix defined. This is because other
			parts of the code (pair potentials, thermodynamics, etc) treat frozen
			particles differently and need to be able to reference a single group
			to which this fix is applied.
			</P>
			<P><B>Related commands:</B> none
			</P>
			<P><A HREF = "atom_style.html">atom_style granular</A>
			</P>
			<P><B>Default:</B> none
			</P>
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