<p>Define a computation that calculates the per-particle mass density.
The mass density is the mass of a particle which is constant during
the course of a simulation, divided by its volume, which can change
due to mechanical deformation.</p>
<p>See <aclass="reference external"href="USER/smd/SMD_LAMMPS_userguide.pdf">this PDF guide</a> to use Smooth
Mach Dynamics in LAMMPS.</p>
<p><strong>Output info:</strong></p>
<p>This compute calculates a per-particle vector, which can be accessed
by any command that uses per-particle values from a compute as input.
See <aclass="reference internal"href="Section_howto.html#howto-15"><spanclass="std std-ref">How-to discussions, section 6.15</span></a> for
an overview of LAMMPS output options.</p>
<p>The per-particle values will be in <aclass="reference internal"href="units.html"><spanclass="doc">units</span></a> of mass over volume.</p>
</div>
<divclass="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 <aclass="reference internal"href="Section_start.html#start-3"><spanclass="std std-ref">Making LAMMPS</span></a> section for more info.</p>
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