[petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code

[Mark Adams]

I am guessing that you are creating a matrix, adding to it, finalizing it
("assembly"), and then adding to it again, which is fine, but you are
adding new non-zeros to the sparsity pattern.
If this is what you want then you can tell the matrix to let you do that.
Otherwise you have a bug.

Mark

On Tue, Dec 19, 2023 at 9:50 PM Shatanawi, Sawsan Muhammad via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> Hello everyone,
>
> I hope this email finds you well.
>
>  My Name is Sawsan Shatanawi, and I am currently working on developing a
> Fortran code for simulating groundwater flow in a 3D system. The code
> involves solving a nonlinear system, and I have created the matrix to be
> solved using the PCG solver and Picard iteration. However, when I tried
> to assign it as a PETSc matrix I started getting a lot of error messages.
>
> I am kindly asking if someone can help me, I would be happy to share my
> code with him/her.
>
> Please find the attached file contains a list of errors I have gotten
>
> Thank you in advance for your time and assistance.
>
> Best regards,
>
>  Sawsan
>
>
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