tolerance for diagonal entries + Slepc

Umut Tabak u.tabak at
Mon Aug 3 06:44:32 CDT 2009

Umut Tabak wrote:
> 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
sorry that I forgot to explain my problem completely, I get this error 
when I try to use Slepc's EPSSolve function, so that the question is 
also related to Slepc I guess. I mean the tolerancing issues for the 

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