[GRASS-user] matlab scripts r.dominant_dir.m and r.calc_terraflow_dir.m

[M S]

I'm looking to use the addon scripts r.dominant_dir.m and
r.calc_terraflow_dir.m, however, I have never used Matlab or Freemat.
I looked around for some examples or documentation on how to run these
scripts for (in?) GRASS, but have not found anything helpful.

Can someone point me to a good resource to learn about this?

Thanks,
Mark