Exporting Matrices of AS method for Poisson Equation

General Discussion
7

Here is what you can do:

  1. replace sym = 1 by sym = 0
  2. replace the current sparams by:
set(A, sparams = "-pc_type gasm -pc_gasm_overlap 2 -pc_gasm_type basic -sub_pc_type cholesky -ksp_type cg -ksp_monitor -ksp_view -pc_gasm_view_subdomains -ksp_view_mat ascii:Poisson:ascii_matlab -ksp_view_rhs ascii:rhs:ascii_matlab -sub_ksp_view_mat ascii:Poisson_"+mpirank+":ascii_matlab");

This will export a Poisson file which is the global system, and Poisson_rank for each local subdomain matrices. In the KSP view, you’ll see each subdomain indices (inner means without overlap, outer means with overlap). It also saves the global right-hand side.