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Tests for the Linear Least Squares (LLS) routines

The LLS test program tests the PxGELS driver routine for computing solutions to over- and underdetermined, full-rank systems of linear equations $A X = B$ ($A$ is $m$-by-$n$). For each test matrix type, we generate three matrices: One which is scaled near underflow, a matrix with moderate norm, and one which is scaled near overflow.

The PxGELS driver computes the least-squares solutions (when $m \ge n$) and the minimum-norm solution (when $m < n$) for an $m$-by-$n$ matrix $A$ of full rank. To test PxGELS, we generate a diagonally dominant matrix $A$, and for $C = A$ and $C = A^H$, we



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Susan Blackford 2001-08-12