Matthew Knepley writes:
> On Thu, Oct 18, 2018 at 12:07 PM Zhang, Hong wrote:
>
>> When you use shell matrix, i.e., matrix-free, you cannot it as a
>> preconditioner. Add option '-pc_type none'.
>>
>
> There are some you can use, like -pc_type cheby
That doesn't exist. You can do the nested
On Thu, Oct 18, 2018 at 12:07 PM Zhang, Hong wrote:
> When you use shell matrix, i.e., matrix-free, you cannot it as a
> preconditioner. Add option '-pc_type none'.
>
There are some you can use, like -pc_type cheby
MAtt
> Hong
>
> On Thu, Oct 18, 2018 at 10:57 AM Florian Lindner
> wrote:
On Thu, 18 Oct 2018 at 17:57, Florian Lindner wrote:
> Hello,
>
> I try to use the KSP solver package together with a shell matrix:
>
>
> MyContext mycontext; // an empty struct, not sure it it's needed?
> Mat s;
> ierr = MatCreateShell(PETSC_COMM_WORLD, size, size, PETSC_DECIDE,
>
When you use shell matrix, i.e., matrix-free, you cannot it as a
preconditioner. Add option '-pc_type none'.
Hong
On Thu, Oct 18, 2018 at 10:57 AM Florian Lindner
mailto:mailingli...@xgm.de>> wrote:
Hello,
I try to use the KSP solver package together with a shell matrix:
MyContext
Hello,
I try to use the KSP solver package together with a shell matrix:
MyContext mycontext; // an empty struct, not sure it it's needed?
Mat s;
ierr = MatCreateShell(PETSC_COMM_WORLD, size, size, PETSC_DECIDE,
PETSC_DECIDE, , );
ierr = MatShellSetOperation(s, MATOP_MULT,
