git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@14950 f3b2605a-c512-4ea7-a41b-209d697bcdaa

doc/html/_sources/dimension.txt

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+.. index:: dimension
+
+dimension command
+=================
+
+Syntax
+""""""
+
+.. parsed-literal::
+
+   dimension N
+
+* N = 2 or 3
+
+Examples
+""""""""
+
+.. parsed-literal::
+
+   dimension 2
+
+Description
+"""""""""""
+
+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
+:doc:`create_box <create_box>` or :doc:`read_data <read_data>` commands.
+Restart files also store this setting.
+
+See the discussion in :doc:`Section_howto <Section_howto>` for
+additional instructions on how to run 2d simulations.
+
+.. 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.
+
+Restrictions
+""""""""""""
+
+
+This command must be used before the simulation box is defined by a
+:doc:`read_data <read_data>` or :doc:`create_box <create_box>` command.
+
+Related commands
+""""""""""""""""
+
+:doc:`fix enforce2d <fix_enforce2d>`
+
+Default
+"""""""
+
+.. parsed-literal::
+
+   dimension 3
+
+
+.. _lws: http://lammps.sandia.gov
+.. _ld: Manual.html
+.. _lc: Section_commands.html#comm