> On Jul 15, 2019, at 11:54 PM, Jed Brown via petsc-users
> wrote:
>
> You can use MatCreateMAIJ(A,2,&M) and a single MatMult(A,xy) where xy
> contains the vectors x and y interlaced [x_0, y_0, x_1, y_1, ...].
>
> There is also MatMatMult(A,X,...,&Y) where X is a MATDENSE with two
> columns,
You can use MatCreateMAIJ(A,2,&M) and a single MatMult(A,xy) where xy
contains the vectors x and y interlaced [x_0, y_0, x_1, y_1, ...].
There is also MatMatMult(A,X,...,&Y) where X is a MATDENSE with two
columns, but I would prefer the MAIJ variant above in most cases.
Tyler Chen via petsc-users
Hello,
I am looking for a way to compute two matrix vector products
simultaneously, where the matrix is the same for both products (i.e. Ax and
Ay). I know some numerical libraries have the concept of "block vectors" or
"basis vectors" and was wondering if there is anything similar in PETSc.
Right
