fix_drag.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 drag command
	</H3>
	<P><B>Syntax:</B>
	</P>
	<PRE>fix ID group-ID drag x y z fmag delta
	</PRE>
	<UL><LI>ID, group-ID are documented in <A HREF = "fix.html">fix</A> command
	<LI>drag = style name of this fix command
	<LI>x,y,z = coord to drag atoms towards
	<LI>fmag = magnitude of force to apply to each atom (force units)
	<LI>delta = cutoff distance inside of which force is not applied (distance units)
	</UL>
	<P><B>Examples:</B>
	</P>
	<PRE>fix center small-molecule drag 0.0 10.0 0.0 5.0 2.0
	</PRE>
	<P><B>Description:</B>
	</P>
	<P>Apply a force to each atom in a group to drag it towards the point
	(x,y,z). The magnitude of the force is specified by fmag. If an atom
	is closer than a distance delta to the point, then the force is not
	applied.
	</P>
	<P>Any of the x,y,z values can be specified as NULL which means do not
	include that dimension in the distance calculation or force
	application.
	</P>
	<P>This command can be used to steer one or more atoms to a new location
	in the simulation.
	</P>
	<P><B>Restrictions:</B> none
	</P>
	<P><B>Related commands:</B>
	</P>
	<P><A HREF = "fix_spring.html">fix spring</A>
	</P>
	<P><B>Default:</B> none
	</P>
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