[Trilinos-Users] [Trilinos-Help] How to extract existing matrix rows during matrix construction
John R. Cary
cary at colorado.edu
Mon Mar 30 13:51:27 MDT 2009
Heroux, Michael A wrote:
> Hi John,
>
> It is very difficult to add entries to a matrix that has already had
> FillComplete called. The only exception is if you are, for example,
> adding a entry to column J in row I in a local submatrix for which
> another row, say K, already has an entry in column J. The reason for
> this restriction is that FillComplete computes off-processor
> dependencies. If you add a new column that is not already accounted
> for, the analysis done in FillComplete is no longer valid.
>
> Is it possible to add the periodicity entries prior to calling
> FillComplete?
Hi Mike,
It certainly is possible. I was hoping to offload some of that logic
on Trilinos, but I now understand what trilinos is doing, and how it
would be easier for me to do it.
Thanks....John
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