Following your comments,
I want to check below things.
For example, the global dense matrix are as below.
[image: image.png]
If I want to get first row ('1 2 0 0 3 0 0 4') in Proc 1.
Then I should put 'MatCreateSubMatrix
<https://petsc.org/main/docs/manualpages/Mat/MatCreateSubMatrix/>(mat, isrow
, NULL, MAT_INITIAL_MATRIX, *&*newmat)'
and isrow will be [0 1 2 3 4 5 6 7].In this case, How can I make isrow? Actually I can't understand the procedure of handling isrow. Hyung Kim 2023년 2월 3일 (금) 오후 9:03, Mark Adams <[email protected]>님이 작성: > https://petsc.org/main/docs/manualpages/Mat/MatCreateSubMatrix/ > > Note, PETSc lets you give NULL arguments if there is a reasonable default. > In this case give NULL for the column IS and you will get the whole > columns. > > Mark > > On Fri, Feb 3, 2023 at 4:05 AM 김성익 <[email protected]> wrote: > >> Hello, >> >> >> By using MatGetRow, user can get vectors from local matrix (at each >> process). >> >> However, I need other process's row values. >> So I have 2 questions. >> >> 1. Is there any function for getting arrays from other process's?? >> >> 2. Or is there any function like matrix version of vecscattertoall?? >> >> Thanks, >> Hyung Kim >> >
