[petsc-users] parallel Mat Mult a serial Vec or a serial Mat

[Hui Zhang]

On Jan 20, 2013, at 5:13 PM, Jed Brown wrote:

> No, MatMult and MatMatMult require all objects to be on the same communicator.

Thanks for the quick answer!  It seems a general rule that all operands and results must be 
on the same communicator.  Can I lift an object from a sub-communicator to the sup-communicator
without changing the parallel layout of the object?

> 
> 
> On Sun, Jan 20, 2013 at 10:12 AM, Hui Zhang <mike.hui.zhang at hotmail.com> wrote:
> parallel Mat, multiplies a serial Vec or a serial Mat
> 
> Is it supported directly? If yes, can the resulting Vec/Mat be serial or parallel?
> 
>