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

doc/html/_sources/fix_oneway.txt

@@ -0,0 +1,72 @@
+.. index:: fix oneway
+
+fix oneway command
+==================
+
+Syntax
+""""""
+
+.. parsed-literal::
+
+   fix ID group-ID oneway N region-ID direction
+
+* ID, group-ID are documented in :doc:`fix <fix>` command
+* oneway = style name of this fix command
+* N = apply this fix every this many timesteps
+* region-ID = ID of region where fix is active
+* direction = *x* or *-x* or *y* or *-y* or *z* or *-z* = coordinate and direction of the oneway constraint
+
+
+Examples
+""""""""
+
+.. parsed-literal::
+
+   fix ions oneway 10 semi -x
+   fix all oneway 1 left -z
+   fix all oneway 1 right z
+
+Description
+"""""""""""
+
+Enforce that particles in the group and in a given region can only
+move in one direction.  This is done by reversing a particle's
+velocity component, if it has the wrong sign in the specified
+dimension.  The effect is that the particle moves in one direction
+only.
+
+This can be used, for example, as a simple model of a semi-permeable
+membrane, or as an implementation of Maxwell's demon.
+
+
+----------
+
+
+Restart, fix_modify, output, run start/stop, minimize info
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+No information about this fix is written to :doc:`binary restart files <restart>`.  None of the :doc:`fix_modify <fix_modify>` options
+are relevant to this fix.  No global or per-atom quantities are stored
+by this fix for access by various :ref:`output commands <howto_15>`.  No parameter of this fix can
+be used with the *start/stop* keywords of the :doc:`run <run>` command.
+This fix is not invoked during :doc:`energy minimization <minimize>`.
+
+Restrictions
+""""""""""""
+ none
+
+Related commands
+""""""""""""""""
+
+:doc:`fix wall/reflect <fix_wall_reflect>` command
+
+**Default:** none
+
+
+----------
+
+
+
+.. _lws: http://lammps.sandia.gov
+.. _ld: Manual.html
+.. _lc: Section_commands.html#comm