Precisely. They support some sparse iterative solvers internally (GC and
BiCGSTAB are blessed, GMRES is in unsupported but looks like it is incoming),
and can interface with SuiteSparse to do sparse direct.
I think we'll easily be able to support the sparse iterative stuff easily
enough, as it is all Eigen3, and I'm looking at the sparse direct. I think an
option to use an installed SuiteSparse it the way to go (building it is
nontrivial), but there is an autotools port that we could fall back to - I'm
playing with that now to see how big it would be
(https://github.com/benkirk/suitesparse.git)
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