fix_lineforce.html
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fix_lineforce.html
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			<H3>fix lineforce command
			</H3>
			<P><B>Syntax:</B>
			</P>
			<PRE>fix ID group-ID lineforce x y z
			</PRE>
			<UL><LI>ID, group-ID are documented in <A HREF = "fix.html">fix</A> command
			<LI>lineforce = style name of this fix command
			<LI>x y z = direction of line as a 3-vector
			</UL>
			<P><B>Examples:</B>
			</P>
			<PRE>fix hold boundary lineforce 0.0 1.0 1.0
			</PRE>
			<P><B>Description:</B>
			</P>
			<P>Adjust the forces on each atom in the group so that it's motion will
			be along the linear direction specified by the vector (x,y,z). This
			is done by subtracting out components of force perpendicular to the
			line.
			</P>
			<P>If the initial velocity of the atom is 0.0 (or along the line), then
			it should continue to move along the line thereafter.
			</P>
			<P>The forces due to this fix are also imposed during an energy
			minimization, invoked by the <A HREF = "minimize.html">minimize</A> command.
			</P>
			<P><B>Restrictions:</B> none
			</P>
			<P><B>Related commands:</B>
			</P>
			<P><A HREF = "fix_planeforce.html">fix planeforce</A>
			</P>
			<P><B>Default:</B> none
			</P>
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