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Sparse cholesky added in sandbox

 

Hello DOLFIN!

I added an interface to the CHOLMOD sparse cholesky solver in the dolfin
sandbox. CHOLMOD is written by the guy who wrote UMFPACK and it is part
of the same distribution (both source and deb), so it really does not
add a new dependency if included in the lib. CHOLMOD was benchmarked in
this paper in ACM TOMS:
http://portal.acm.org/citation.cfm?doid=1236463.1236465 and came out on
top (for symmetric definite systems).

Please pull from fenics.org:~dag/home/hg/dolfin

/Dag

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