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

doc/html/_sources/improper_zero.txt

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+.. index:: improper_style zero
+
+improper_style zero command
+===========================
+
+Syntax
+""""""
+
+.. parsed-literal::
+
+   improper_style zero *nocoeff*
+
+Examples
+""""""""
+
+.. parsed-literal::
+
+   improper_style zero
+   improper_style zero nocoeff
+   improper_coeff *
+
+Description
+"""""""""""
+
+Using an improper style of zero means improper forces and energies are
+not computed, but the geometry of improper quadruplets is still
+accessible to other commands.
+
+As an example, the :doc:`compute improper/local <compute_improper_local>` command can be used to
+compute the chi values for the list of quadruplets of improper atoms
+listed in the data file read by the :doc:`read_data <read_data>`
+command.  If no improper style is defined, this command cannot be
+used.
+
+The optional *nocoeff* flag allows to read data files with a ImproperCoeff
+section for any improper style. Similarly, any improper_coeff commands
+will only be checked for the improper type number and the rest ignored.
+
+Note that the :doc:`improper_coeff <improper_coeff>` command must be
+used for all improper types, though no additional values are
+specified.
+
+Restrictions
+""""""""""""
+ none
+
+**Related commands:** none
+
+:doc:`improper_style none <improper_none>`
+
+**Default:** none
+
+
+.. _lws: http://lammps.sandia.gov
+.. _ld: Manual.html
+.. _lc: Section_commands.html#comm