Also if you know that the rows/cols are contiguous (next to each other) in your sparse matrix then it is recommended to use MatSetValuesBlocked as it is more efficient.
Best regards, Jacob Faibussowitsch (Jacob Fai - booss - oh - vitch) Cell: (312) 694-3391 > On Apr 13, 2020, at 10:32 AM, Junchao Zhang <[email protected]> wrote: > > Add two rows 2 ,4, and each row has three nonzeros at column 3, 7, 9 > m=2; > n=3; > idxm[] = {2, 4}; > idxn[] = {3, 7, 9}; > v[6] = {0.1, 0.2, ....}; > MatSetValues(mat, m, idxm, n, idxn,v, INSERT_VALUES); > > --Junchao Zhang > > > On Mon, Apr 13, 2020 at 9:59 AM Bin Liu <[email protected] > <mailto:[email protected]>> wrote: > Hi all, > > > > I know how to insert values in one row into the matrix via routine > “MatSetValues”. I understand I logically should be able to insert multiple > rows into the matrix with one call of “MatSetValues”. However, I am not sure > how to do it. I searched in the PETSc mail list and did not find a relevant > question answered before. Could anyone help me and give me a simple example > code? > > > > Regards > > B. >
