[petsc-users] about MatTranspose

[Matthew Knepley]

On Wed, Aug 31, 2011 at 12:48 AM, Likun Tan <likunt at andrew.cmu.edu> wrote:

>
> I have MPIDense matrix, if i want to get the tranpose of the matrix, what
> should i do? Or i should use MPISparse instead?


If it is rectangular, create the transpose matrix first, then call
MatTranspose.

  Matt


> On Tue, August 30, 2011 7:08 pm, Matthew Knepley wrote:
> > On Tue, Aug 30, 2011 at 10:59 PM, Likun Tan <likunt at andrew.cmu.edu>
> > wrote:
> >
> >
> >>
> >> Dear all,
> >>
> >>
> >> Can MatTranspose be used on non-squra matrix? I have a matrix with size
> >>  200*27, and i want to get the tranpose of it.
> >>
> >>
> >
> > I assume you are talking about dense matrices. If so, yes.
> >
> >
> >
> >> Second question is, if the 200*27 is partitioned by row, how is the
> >> tranpose stored in each processor? Is it stored by column?
> >>
> >
> > For MPIDENSE, you cannot in-place transpose unless it is square.
> > Otherwise,
> > you provide the transpose matrix, so you determine the layout.
> >
> > Matt
> >
> >
> >
> >> Thanks,
> >> Likun
> >>
> >>
> >>
> >
> >
> > --
> > What most experimenters take for granted before they begin their
> > experiments is infinitely more interesting than any results to which
> their
> > experiments lead. -- Norbert Wiener
> >
> >
>
>
>
>
>


-- 
What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
lead.
-- Norbert Wiener
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