Thanks for your example. My problem is resolved. Meanwhile I am wondering, if it is possible to make this example more flexible. I mean what if the columns in each row are different? Is there any way to insert them all together?
Regards Bin From: Junchao Zhang [mailto:[email protected]] Sent: Monday, 13 April 2020 11:33 PM To: Bin Liu <[email protected]> Cc: [email protected] Subject: Re: [petsc-users] inserting multiple rows together into a matrix 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.
