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# LAMMPS NUMDIFF EXAMPLES FOR FORCES, VIRIAL, and BORN MATRIX
## Numerical Difference Fixes and Computes
This directory contains the input script for an NVE simulation with
fix numdiff, fix numdiff/virial, and compute born/matrix numdiff.
In each cases, results are compared to exact analytic expressions
and the small relative differences are reported.
Example:
```
NP=4 #number of processors
mpirun -np $NP lmp_mpi -in.numdiff
```
## Required LAMMPS packages: EXTRA-FIX, EXTRA-COMPUTE
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