[petsc-users] Set the options NOT from argc and argv

[Longxiang Chen]

The fortran program is too long (several files with more than 10,000 lines).
And I just want to insert the P_solve inside one of the subroutine to solve
Ax=b.
Or it can only use argc and argv?

Thanks.
Longxiang

Best regards,
Longxiang Chen

Do something every day that gets you closer to being done.
--------------------------------------------------------------
465 Winston Chung Hall
Computer Science Engineering
University of California, Riverside



On Mon, May 20, 2013 at 8:52 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
> On May 20, 2013, at 10:38 PM, Longxiang Chen <suifengls at gmail.com> wrote:
>
> > To whom it may concern,
> >
> > I am using KSP to solve Ax=b.
> > The main() is in Fortran, and it calls a function I write in C.The
> parameter is array A, x, b.
> >
> > void P_solve(double x[ ], double b[ ], double A[ ], int size);
> >
> > In the function, I should call PetscInitialize() before I create the
> matrix and vectors for A, x, b, and also call MatSetFromOptions() and
> VecSetFromOptions().
> >
> > But I don't have the argc and argv from main function.
>
>     If Fortran is the main program the options database still has access
> to the command line arguments. You should still be able to use command line
> arguments and not need to set them in the program.
>
>      Does this not work? Can you send a sample program where it does not
> work?
>
>    Barry
>
> >
> > I just want to fix the KSP type to bcgs and the PC type.
> > Is there another way that I can set the options not through argc and
> argv, just set them in the program.
> >
> > e.g. options[] = {"-ksp_type", "bcgs"}.
> >
> > Thanks,
> > Longxiang
>
>
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