[petsc-users] PetscOptionsSetValue syntax

[Karthikeyan Chockalingam - STFC UKRI]

Hello,

I would like to move from code to using options.

   KSP           ksp;
    PC            pc;
    KSPCreate(PETSC_COMM_WORLD, &ksp);
    KSPSetOperators(ksp, A, A);

I tried using PetscOptionsSetValue as below


    ierr = PetscOptionsSetValue(NULL,"-ksp_type", "cg"); CHKERRQ(ierr);

    ierr = PetscOptionsSetValue(NULL,"-pc_type", "jacobi"); CHKERRQ(ierr);

    ierr = PetscOptionsSetValue(NULL, "-ksp_monitor", NULL);CHKERRQ(ierr);

    ierr = PetscOptionsSetValue(NULL, "-ksp_view", NULL);CHKERRQ(ierr);

    ierr = PetscOptionsSetValue(NULL, "-ksp_monitor_true_residual", NULL);CHKERRQ(ierr);

    ierr = PetscOptionsSetValue(NULL, "-ksp_converged_reason", NULL);CHKERRQ(ierr);



    KSPSolve(ksp, b, x);

But I believe none of the string flags where picked up by PETSc. What am I missing?

Thank you for your help.

Kind regards,
Karthik.

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