[petsc-users] Element by element comparison of matrices

[Stefano Zampini]

MatAXPY for the difference, MatNorm for the relative error

On Thu, Jan 2, 2025, 22:32 Hammond, Glenn E via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> PETSc Users,
>
>
>
> I want to compare two Jacobians matrices (one with derivatives calculated
> analytically; the other numerically). I want to apply relatives and/or
> absolute tolerances. Does anyone know if such capability is built into
> PETSc? I cannot find anything other the MatEqual() with compares down to
> the bit. Otherwise, I plan to use MatGetValues() and compare the elements
> individually. Just hoping there is something more convenient hidden
> somewhere.
>
>
>
> Thanks,
>
>
>
> Glenn
>
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