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

doc/html/_sources/compute_erotate_rigid.txt

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+.. index:: compute erotate/rigid
+
+compute erotate/rigid command
+=============================
+
+Syntax
+""""""
+
+.. parsed-literal::
+
+   compute ID group-ID erotate/rigid fix-ID
+
+* ID, group-ID are documented in :doc:`compute <compute>` command
+* erotate/rigid = style name of this compute command
+* fix-ID = ID of rigid body fix
+
+Examples
+""""""""
+
+.. parsed-literal::
+
+   compute 1 all erotate/rigid myRigid
+
+Description
+"""""""""""
+
+Define a computation that calculates the rotational kinetic energy of
+a collection of rigid bodies, as defined by one of the :doc:`fix rigid <fix_rigid>` command variants.
+
+The rotational energy of each rigid body is computed as 1/2 I Wbody^2,
+where I is the inertia tensor for the rigid body, and Wbody is its
+angular velocity vector.  Both I and Wbody are in the frame of
+reference of the rigid body, i.e. I is diagonalized.
+
+The *fix-ID* should be the ID of one of the :doc:`fix rigid <fix_rigid>`
+commands which defines the rigid bodies.  The group specified in the
+compute command is ignored.  The rotational energy of all the rigid
+bodies defined by the fix rigid command in included in the
+calculation.
+
+**Output info:**
+
+This compute calculates a global scalar (the summed rotational energy
+of all the rigid bodies).  This value can be used by any command that
+uses a global scalar value from a compute as input.  See
+:ref:`Section_howto 15 <howto_15>` for an overview of
+LAMMPS output options.
+
+The scalar value calculated by this compute is "extensive".  The
+scalar value will be in energy :doc:`units <units>`.
+
+Restrictions
+""""""""""""
+
+
+This compute is part of the RIGID package.  It is only enabled if
+LAMMPS was built with that package.  See the :ref:`Making LAMMPS <start_3>` section for more info.
+
+Related commands
+""""""""""""""""
+
+:doc:`compute ke/rigid <compute_erotate_ke_rigid>`
+
+**Default:** none
+
+
+.. _lws: http://lammps.sandia.gov
+.. _ld: Manual.html
+.. _lc: Section_commands.html#comm