The ** QL** and

and

These factorizations are computed by PxGEQLF and PxGERQF, respectively; they are less commonly used than either the

All the factorization routines discussed here (except PxTZRZF)
allow
arbitrary *m* and *n*, so that in some cases the matrices *R* or *L* are
trapezoidal rather than triangular.
A routine that performs pivoting is provided only for the *QR* factorization.

**Table 3.7:** Computational routines for orthogonal factorizations

Tue May 13 09:21:01 EDT 1997