If I am correct, to do this, it will double the peak memory usage. Is there any way no to double the peak memory usage?
Schlumberger-Private From: Barry Smith <bsm...@petsc.dev> Sent: Monday, August 31, 2020 1:56 PM To: Kun Jiao <kj...@slb.com> Cc: petsc-users <petsc-users@mcs.anl.gov> Subject: [Ext] Re: [petsc-users] change matrix Kun, This is not possible, PETSc matrices have a static size (resizing in parallel is tricky so we don't support it). If it is more efficient to reuse the matrix entries than recompute them you can create a larger matrix and then loop over the old matrix calling MatGetRow() and then call MatSetValues() to copy that row into the new matrix. Barry On Aug 31, 2020, at 1:51 PM, Kun Jiao via petsc-users <petsc-users@mcs.anl.gov<mailto:petsc-users@mcs.anl.gov>> wrote: Hi Petsc Experts, Trying to do something like appending some rows (~100 rows) to an already created matrix, but could not find any document about it. Could anyone provide some information about it? Regards, Kun Schlumberger-Private
