[petsc-users] fieldsplit: Unhandled case, must have at least two fields, not 1!

[Jed Brown]

Mark Adams <mfadams at lbl.gov> writes:

>>
>>
>>
>>       if (i == 0) {
>>         for (f = 0; f < numFields; ++f) {
>>           ierr = PCFieldSplitSetIS(pc, fieldNames[f],
>> fields[f]);CHKERRQ(ierr);
>>           ierr = PetscFree(fieldNames[f]);CHKERRQ(ierr);
>>           ierr = ISDestroy(&fields[f]);CHKERRQ(ierr);
>>         }
>>
>> numFields should be 2.  Compare to src/snes/examples/tutorials/ex28.c
>> (adapting runex28_3),
>>
>
> The matrix/solver just has one field. The error comes from giving it field
> split parameters by mistake.

So this is a different KSP; not the one you want to use fieldsplit on?

Please always use different prefixes for different solvers.
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