[petsc-users] matzeroentries usage

[NAN ZHAO]

Dear all,

I need to solve Ax=b in a iteratively, and the A is b is ajusted in each
iteration. I am using matzeroentries to zeroout the values in A (A is in
MPIBAIJ format). Somehow, I found this cause me some unexpected wrong
solutions. I do not want to retain the non-zero structures in A when I try
to zero it. Does anyone have a idea to do that. Or I need to destroy the A
matrix each time I give new values to it (the non-zero structure is
changing).

Thanks,
Nan
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