BDDC is a domain decomposition solver of the non-overlapping type and
cannot be used on assembled operators.
If you want to use it, you need to restructure your code a bit.
I presume from your message that your current approach is
1) generate_assembled_csr
2) decompose_csr? or decompose_mesh?
3)
Hello sir,
I am a PhD student and am trying to use the PCBDDC method in petsc to solve
the matrix, but the final result is wrong. So I would like to ask you a few
questions.
First I will describe the flow of my code, I first used the finite element
method to build the total matrix in CSR format
