By the way, the block of my matrix is like : U , a A^T , 0
---------- Forwarded message ---------- From: Zhu Liang <[email protected]> Date: Aug 13, 2007 5:46 AM Subject: How can I use BICGStab on a matrix with zero entries on the diagonal To: petsc-users at mcs.anl.gov 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20070813/3db86e30/attachment.htm>
