crash in mshm_refine

[c.]

Hi Marco,

try the following:

  msh = msh3m_structured_mesh (1:80,1:80,1:80,1,1:6);
  msh = mshm_refine (msh, 1);

on my system this crashes Octave.

Even though this problem could actually be too large to handle,
the crash should not happen, I think you should check the validity
of your pointers before writing the output mesh.

c.