[petsc-users] how to scale the diagonal of a matrix

[Jed Brown]

丁老师 <ztdepyahoo at 163.com> writes:

>   i want to implement the under-relaxation version of the equation. it
>   nees to scale the diagonal value a matrix with the relaxation
>   factor, could you please tell me how to achieve this goal.

This sounds like damped Richardson, perhaps preconditioned by Jacobi,
but if you really want to do in-place scaling, there is MatShift and
MatDiagonalScale, depending on what you're after.
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