tree 63032cdd3ccf82949bde0cac4673095954f0d612
parent 17becf4610a238c990e874bfda2df71047f20b7d
author Sameer Agarwal <sameeragarwal@google.com> 1567606176 -0700
committer Sameer Agarwal <sameeragarwal@google.com> 1569333210 -0700

Introduce BlockSparseMatrixData

A number of algorithms like the SchurEliminator do not need
access to the full BlockSparseMatrix interface. They only
need read only access to the values array and the block structure.

This change introduces, BlockSparseDataMatrix a struct that carries
these two bits of information and modifies the Schur type algorithms
to use it.

What this change will allow us to do, in a subsequent CL is to
take the values array of a BlockSparseMatrix and pair it with
a different blocks structure for subset preconditioning.

Change-Id: I1808f12531b586c9ff4d6a70b3d390c7b0d9f441