[Trilinos-Users] extracting submatrices from Epetra_RowMatrix

[Jesse Chan]

Hi all
I'm starting with an Epetra_LinearProblem which holds a finite element
stiffness matrix/load vector, and I'm trying to extract off-diagonal
submatrices corresponding to edge and field indices to do static
condensation (compute the Schur complement).

I've looked into using Epetra Import and Export for this, but the
documentation seems very sparse on it (for example, I couldn't find any
documentation detailing the different Import/Export options such as "Add"
or "Insert").  Are the Import/Export capabilities the best way to do this,
and if so, is there more comprehensive documentation than in the Trilinos
Tutorial or Class Reference pages?  If not, are there any other options
inside Trilinos?

Thanks!

- Jesse
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