set a column of a matrix

[Barry Smith]

    Is your matrix dense?  If it is sparse then it doesn't make sense  
to take values from a vector (which is always dense) to a sparse matrix.

    Barry

On Nov 1, 2009, at 10:57 AM, Umut Tabak wrote:

> On Sun, Nov 01, 2009 at 07:44:58AM -0600, Barry Smith wrote:
>>
>>   MatSetValues() so long as you have good matrix preallocation this
>> will work fine.
>>
>>   Doing a transpose is very expensive.
>>
> Dear Barry and Matt,
>
>     Thanks for the replies, I am not doing anything in parallel. I
>     should use MatSetValues with appropriate column and row indices.
>
>     Actually, what I would like to do, I would like to set up a
>     vectorset(rectangular) and assign to a block in a matrix. Is
>     there a vectorset that I could use directly to somehow put
>     these vectors directly into this set. And use this vectorset to
>     set some part of a matrix.
>
>     Thanks for the advice in advance.
>
>     BR,
>     Umut
> -- 
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