[petsc-users] inserting multiple rows together into a matrix

[Junchao Zhang]

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 <lbllm2018 at hotmail.com> 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.
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20200413/c0f28914/attachment-0001.html>