How to generate a parallel matrix with a sequential dense matrix?

[Matthew Knepley]

On Mon, Sep 22, 2008 at 1:34 PM, Yujie <recrusader at gmail.com> wrote:
> Thank you for your reply, Matt. I have checked the tutorials. They just use
> specified values and MatSetValues() to make a parallel matrix. Now, the
> matrix I use is in a single node of the cluster. I have 'M' nodes in this
> cluster. I need to copy the sequential matrix to other 'M-1' nodes and then
> use MatSetValues() or I just use MatSetvalues() in the node where the matrix
> is? The latter should work, right? thanks.

The idea is to set the values owned by a given process, on that process. You can
set all the values from one place, however that would mean a lot of
communication.

  Matt

> Yujie
>
> On Mon, Sep 22, 2008 at 11:09 AM, Matthew Knepley <knepley at gmail.com> wrote:
>>
>> The right way to do this is to input the matrix using MatSetValues()
>> in a distribute fashion. You can consult any of the tutorials, for
>> instance
>> KSP ex2 for an example of this.
>>
>>  Matt
>>
>> On Mon, Sep 22, 2008 at 12:57 PM, Yujie <recrusader at gmail.com> wrote:
>> > Hi, Petsc developer
>> >
>> > Now, I have a sequential dense matrix. How to get a parallel matrix
>> > based on
>> > it? thanks a lot.
>> >
>> > Regards,
>> >
>> > Yujie
>> --
>> 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