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? > >
