[petsc-users] hand-coded Jacobian

Jed Brown jed at 59A2.org
Sun Jul 11 05:37:24 CDT 2010

On Sun, 11 Jul 2010 00:50:30 -0400, "(Rebecca) Xuefei YUAN" <xy2102 at columbia.edu> wrote:
> Dear all,
> If testing the hand coded Jacobian, the ratio is 1e-10, but the  
> difference is 1e-4, would this be some mistakes in Jacobian?

This is fine, it just means that your matrix hasn't been scaled to O(1).


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