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compute_coord_atom.html

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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>compute coord/atom command
</H3>
<P><B>Syntax:</B>
</P>
<PRE>compute ID group-ID coord/atom cutoff
</PRE>
<UL><LI>ID, group-ID are documented in <A HREF = "compute.html">compute</A> command
<LI>coord/atom = style name of this compute command
<LI>cutoff = distance within which to count coordination neighbors (distance units)
</UL>
<P><B>Examples:</B>
</P>
<PRE>compute 1 all coord/atom 2.0
</PRE>
<P><B>Description:</B>
</P>
<P>Define a computation that calculates the coordination number for each
atom in a group. This can be output via the <A HREF = "dump.html">dump custom</A>
command.
</P>
<P>The coordination number is defined as the number of neighbor atoms
within the specified cutoff distance from the central atom.
</P>
<P>The neighbor list needed to compute this quantity is constructed each
time the calculation is performed (i.e. each time a snapshot of atoms
is dumped). Thus it can be inefficient to compute/dump this quantity
too frequently or to have multiple compute/dump commands, each of a
<I>coord/atom</I> style.
</P>
<P><B>Restrictions:</B> none
</P>
<P><B>Related commands:</B> none
</P>
<P><B>Default:</B> none
</P>
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