Dear professor:
In the ksp example ex50.c, i do not understand the meaning of
KSPSolve(ksp,NULL,NULL);
nMatNullSpaceCreate(PETSC_COMM_WORLD,PETSC_TRUE,0,0,&nullspace);
What is the meaning of NULL in the kspsolve. and two "0" in the
MatNullSpaceCreate.
Regards
At 2016-09-24 00:25:09, "Jed Brown" <[email protected]> wrote:
>"Kong, Fande" <[email protected]> writes:
>
>> Any references on this topic except the users manual? I am interested in
>> mathematics theory on this topic.
>
>These are relevant. I've only skimmed them briefly, but they might
>suggest ways to improve PETSc's handling of singular systems. The
>technique is ancient.
>
>https://doi.org/10.1137/S0895479803437803
>
>https://doi.org/10.1007/s10543-009-0247-7
