How can I use BICGStab on a matrix with zero entries on the diagonal

[Zhu Liang]

Dear petsc-users

When I try to solve a linear equation Ax=b with BicgStab preconditioner, I
got
an error "Matrix is missing diagonal number".  That is because I have zeros
on
the diagonal of the matrix.

I am wondering if there is some simple method to avoid that?

Best,
Liang
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