<p>Define a computation that returns the number of neighbor particles
inside of the smoothing kernel radius for particles interacting via
the updated Lagrangian SPH pair style.</p>
<p>See <a class="reference external" href="USER/smd/SMD_LAMMPS_userguide.pdf">this PDF guide</a> to using Smooth
Mach Dynamics in LAMMPS.</p>
<p><strong>Output info:</strong></p>
<p>This compute returns a per-particle vector, which can be accessed by
any command that uses per-particle values from a compute as input.
See <a class="reference internal" href="Section_howto.html#howto-15"><span class="std std-ref">Section 6.15</span></a> for an overview of
LAMMPS output options.</p>
<p>The per-particle values will be given dimentionless, see <a class="reference internal" href="units.html"><span class="doc">units</span></a>.</p>
</div>
<div class="section" id="restrictions">
<h2>Restrictions</h2>
<p>This compute is part of the USER-SMD package. It is only enabled if
LAMMPS was built with that package. See the <a class="reference internal" href="Section_start.html#start-2"><span class="std std-ref">Making LAMMPS</span></a> section for more info. This compute
can only be used for particles which interact with the updated
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