[petsc-users] MatDenseGetArray question

[Jed Brown]

Michael Povolotskyi <mpovolot at purdue.edu> writes:

> Thank you, one more detail about MatDenseGetArray
> is this statement correct:
> if a dense matrix is serial, the data is stored in memory in a 
> column-wise order, 

Yes.

> but if a dense matrix is distributed the data is stored in a row-wise
> order?

No, it's still column-major storage, but each process only owns a range
of rows.  So the distributed memory partition is by row.

If you have large dense matrices, then chances are that you should
switch from MATDENSE to MATELEMENTAL anyway.