[petsc-users] The default nonzero pattern for SuperLU_dist.

[Xuefei (Rebecca) Yuan]

Dear Barry,

Thanks for your kind reply. So if I set up the following:

        ierr = DAGetMatrix(DMMGGetDA(dmmg), MATAIJ, &jacobian);CHKERRQ(ierr);
        KSP     ksp;
        ierr = SNESGetKSP(DMMGGetSNES(dmmg),&ksp);CHKERRQ(ierr);
        ierr = KSPSetOperators(ksp,jacobian,jacobian,SAME_NONZERO_PATTERN);CHKERRQ(ierr);

	ierr = DMMGSolve(dmmg);CHKERRQ(ierr);

This will specify the nonzero pattern as the same? How could I check if I have set this up right?

Thanks,

Rebecca


On Aug 31, 2011, at 2:42 PM, Barry Smith wrote:

> 
> On Aug 31, 2011, at 4:40 PM, Xuefei (Rebecca) Yuan wrote:
> 
>> Hello all,
>> 
>> Is the default nonzero pattern for SuperLU_dist is SAME_NONZERO_PATTERN?
> 
>   There is no default nonzero pattern. You always must set it when you call KSPSetOperators() or in your SNES FormFunction. The PETSc SUPERLU_dist interface allows either pattern and should work correctly.
> 
> 
>    Barry
> 
>> 
>> Thanks!
>> 
>> Best,
>> 
>> Rebecca
>> 
>