<p>Define a computation that calculates the rate of the strain tensor for
particles interacting via the Total-Lagrangian SPH pair style.</p>
<p>See <aclass="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 calculates a per-particle vector of vectors (tensors),
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 values will be given in <aclass="reference internal"href="units.html"><spanclass="doc">units</span></a> of one over time.</p>
<p>The per-particle vector has 6 entries, corresponding to the xx, yy,
zz, xy, xz, yz components of the symmetric strain rate tensor.</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>
<p>This quantity will be computed only for particles which interact with
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