crash in mshm_refine

[c.]

marco,

try the following: 

 m1 = msh2m_structured_mesh (0:10, 0:10, 1, 1:4);
 m2 = mshm_refine (m1, 9e7)

or this:

 m1 = msh2m_structured_mesh (0:10, 0:10, 1, 1:4);
 m2 = mshm_refine (m1, 0)

I think you should handle these cases in a more safe way …
c.