Hello,

I am using Mumps to solve a problem with multiple time steps. The matrix structure does not change  but its value may or may not change  during those steps. That means I should reuse the symbolic factorization but recall numeric factorization when needed.

I have found the following anwser of a similar question

https://lists.mcs.anl.gov/pipermail/petsc-users/2020-August/041846.html

which says "it automatically uses the same factorization", but I don't know if it includes numerical factorization also.

My question is :

1. Does numeric factorization do automatically? If not

2. Could I control when numeric factorization should be done and how to do it?

Much thanks

YUAN