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 < [email protected]> 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