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

["Zhu Liang" <liangcanada@xxxxxxxxx>]

By the way, the block of my matrix is like :

 

U ,     a

A^T ,   0

 

 

---------- Forwarded message ----------
From: Zhu Liang <liangcanada@xxxxxxxxx>
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@xxxxxxxxxxx

 

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