Matrix Set LSQ

LSQ: Least squares problems in surveying

from the Harwell-Boeing Collection

Set LSQ
Source:	Michael Saunders, SOL, Stanford University.
Discipline:	Surveying
Accession:	Summer 1979

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.

Matrices in this set:

WELL1033 (real unsymmetric, 1033 by 320, 4732 entries)
ILLC1033 (real unsymmetric, 1033 by 320, 4732 entries)
WELL1850 (real unsymmetric, 1850 by 712, 8758 entries)
ILLC1850 (real unsymmetric, 1850 by 712, 8758 entries)
Download the entire set LSQ (single compressed file, 163338 bytes).
Help: My browser can't read the compressed data file. What now?

The Matrix Market is a service of the Mathematical and Computational Sciences Division / Information Technology Laboratory / National Institute of Standards and Technology.

[ Home ] [ Search ] [ Browse ] [ Resources ]

Last change in this page: Wed Sep 22 13:33:45 US/Eastern 2004 [Comments: ]