|Source:||Michael Saunders, SOL, Stanford University.|
Four matrices from the least-squares solution of problems in surveying that were used by Michael Saunders and Chris Paige in the testing of LSQR. The second and fourth matrix have the same pattern as the first and third respectively but are much more ill-conditioned with respect to conjugate gradients.
These matrices were used to test iterative methods.
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Last change in this page: Wed Sep 22 13:33:45 US/Eastern 2004 [Comments: ]