LAM: Matrix mult / Inversion in Octave with MPITB

Hi.
I have a working non parallel code in Octave that I am trying to set up to work in parallel.  Really what I need is to run a few pieces of the code in Parallel, one big matrix multiplication and one big matrix inversion (actually it uses the backslash operator).  I see many of the sample mpitb octave codes seem to split up the processes manually, sending them to different nodes; I am not sure how I would do that here. ; Any good info on how to do this would be great, perhaps even a nice reference on using mpitb with octave would also be great.  I am very new to using mpi, so I a might be missing something basic.

Thanks,
Mike