> -snes_test_jacobian -snes_test_jacobian_view
> On Jan 2, 2025, at 5:34 PM, Hammond, Glenn E wrote:
>
> I need to element info (which row/col combo) to pinpoint which crossterm may
> be defective. This is important when debugging analytical derivatives for
> chemical reactions. I will look
I need to element info (which row/col combo) to pinpoint which crossterm may be
defective. This is important when debugging analytical derivatives for chemical
reactions. I will look into thr SNES approach.
Thanks,
Glenn
On Jan 2, 2025, at 2:25 PM, Barry Smith wrote:
Check twice before you
We also have support for this built into SNES. For example, you provide the
analytic to SNES which then compute via differencing, mostly to check if the
analytic implementation was correct. You can run an entire set of SNESSolve
with this turned on and it will check at all vectors the Jacobi
MatAXPY for the difference, MatNorm for the relative error
On Thu, Jan 2, 2025, 22:32 Hammond, Glenn E via petsc-users <
petsc-users@mcs.anl.gov> wrote:
> PETSc Users,
>
>
>
> I want to compare two Jacobians matrices (one with derivatives calculated
> analytically; the other numerically). I want
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 d
