tolerance for diagonal entries

[Umut Tabak]

Dear all,

I am reading some matrices into petsc, but some of the diagonal entries 
are really small, on the order of e-8. Petsc complains about missing 
diagonal entries, I guess it compares them with some predefined 
tolerance value, is there a way to change/set these tolerances?

Error is "Matrix is missing diagonal entry 1847!" after read from a 
matrix market formatted text file.

Best regards,
Umut