[petsc-users] Element by element comparison of matrices

[Hammond, Glenn E]

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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