[Trilinos-Users] Questions about InsertGlobalValues

Williams, Alan B william at sandia.gov
Wed Sep 8 10:19:04 MDT 2010

> then how do I go about actually generating the graph since in
> InsertGlobalIndices  column mapping is an input?

InsertGlobalIndices takes a list of column-indices for specified rows. A matrix-graph is the mapping of column-indices to rows. i.e., the sparsity-structure of the matrix.

> I would like to avoid creating column mapping because it changes as I
> iterate and would have to be updated for every iteration.

I must not understand what you're trying to do. If your column mapping changes, your matrix-graph will have to be updated (destroyed and recreated), because a matrix-graph is the mapping of columns to rows.

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