[petsc-users] vector outer product

[Matthew Knepley]

On Thu, Aug 9, 2012 at 9:56 PM, Yifei Li <yifli82 at gmail.com> wrote:

> Matt,
>
> I'm new to PETSC, can you pls explain what you mean by 'keep it in
> unassembled form'?
>

Just keep two vectors, u^T v, instead of the dense matrix.

   Matt


> A small example would be nice too. Thanks
>
> Yifei
>
> On Thu, Aug 9, 2012 at 9:15 PM, Matthew Knepley <knepley at gmail.com> wrote:
>
>> On Thu, Aug 9, 2012 at 5:39 PM, Yifei Li <yifli82 at gmail.com> wrote:
>>
>>> Hi,
>>>
>>> I did not find any function doing this in the manual.  Could someone
>>> suggest a good way to do this?
>>>
>>
>> That gives a dense matrix. You would never want to do this. You would
>> keep it in unassembled form.
>>
>>     Matt
>>
>>
>>>
>>> Thanks
>>>
>>> Yifei
>>>
>>
>>
>>
>> --
>> 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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