>From https://petsc.org/release/docs/manualpages/Mat/MatSetOption.html,
MAT_KEEP_NONZERO_PATTERN <https://petsc.org/release/docs/manualpages/Mat/MatOption.html#MatOption> indicates when MatZeroRows <https://petsc.org/release/docs/manualpages/Mat/MatZeroRows.html#MatZeroRows>() is called the zeroed entries are kept in the nonzero structure So, if you have this option true and you set to a previous location, then it is fine, otherwise you also need MAT_NEW_NONZERO_ALLOCATION_ERR <https://petsc.org/release/docs/manualpages/Mat/MatOption.html#MatOption> to be false to do so. --Junchao Zhang On Mon, Sep 13, 2021 at 2:34 PM Anthony Paul Haas <a...@email.arizona.edu> wrote: > Hello, > > Is it allowed after a MatZeroRows to insert more values in the row that > was just zeroed with MatSetValues and then perform another full assembly of > the matrix? > > Thanks, > > Anthony >
