[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 for, the analysis done in FillComplete is no longer valid.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.


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