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Author SHA1 Message Date
Sameer Agarwal 0e2743e24d Add BlockRandomAccessDiagonalMatrix. 
This class is used in the SchurJacobiPreconditioner for
storing the preconditioner matrix. Using it speeds up
the computation of the preconditioner by ~15% due to
the elimination of a hash table lookup.

Change-Id: Iba2b34aad0d9eb9bcb7f6e6fad16aa416aac0d2a
 2013-10-24 19:40:38 +00:00