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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>dimension command
	</H3>
	<P><B>Syntax:</B>
	</P>
	<PRE>dimension N
	</PRE>
	<UL><LI>N = 2 or 3
	</UL>
	<P><B>Examples:</B>
	</P>
	<PRE>dimension 2
	</PRE>
	<P><B>Description:</B>
	</P>
	<P>Set the dimensionality of the simulation. By default LAMMPS runs 3d
	simulations. To run a 2d simulation, this command should be used
	prior to setting up a simulation box via the
	<A HREF = "create_box.html">create_box</A> or <A HREF = "read_data.html">read_data</A> commands.
	Restart files also store this setting.
	</P>
	<P>See the discussion in <A HREF = "Section_howto.html">Section_howto</A> for
	additional instructions on how to run 2d simulations.
	</P>
	<P>IMPORTANT NOTE: Some models in LAMMPS treat particles as finite-size
	spheres or ellipsoids, as opposed to point particles. In 2d, the
	particles will still be spheres or ellipsoids, not circular disks or
	ellipses, meaning their moment of inertia will be the same as in 3d.
	</P>
	<P><B>Restrictions:</B>
	</P>
	<P>This command must be used before the simulation box is defined by a
	<A HREF = "read_data.html">read_data</A> or <A HREF = "create_box.html">create_box</A> command.
	</P>
	<P><B>Related commands:</B>
	</P>
	<P><A HREF = "fix_enforce2d.html">fix enforce2d</A>
	</P>
	<P><B>Default:</B>
	</P>
	<PRE>dimension 3
	</PRE>
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