how to sum two matrices?

[Barry Smith]

   If PETSc  had a function that does a direct sum as you requested I  
would have told you.
Just do a copy, a scale and then an MatAXPY()

    Barry

On Dec 17, 2008, at 3:33 PM, Yujie wrote:

> Hi, Barry
>
> I want to do A=a1A1+a2A2. MatAXPY is just for Y = a*X + Y. Though I  
> can realize my application, it is not good. Do you have direct  
> function for my application? thanks a lot.
>
> Regards,
>
> Yujie
>
>
> On Wed, Dec 17, 2008 at 1:17 PM, Barry Smith <bsmith at mcs.anl.gov>  
> wrote:
>
>  MatAXPY()
>
>
> On Dec 17, 2008, at 3:02 PM, Yujie wrote:
>
> Hi,
>
> I have matrices A1 and A2. It is distributed in the cluster. Their  
> distribution is same
>
> I want to do A=a1A1+a2A2. How to do it? I can't find the suitble  
> function. thanks a lot.
>
> Regards,
>
> Yujie
>
>
>