
DORG2L(l) ) DORG2L(l)
NAME
DORG2L  generate an m by n real matrix Q with orthonormal columns,
SYNOPSIS
SUBROUTINE DORG2L( M, N, K, A, LDA, TAU, WORK, INFO )
INTEGER INFO, K, LDA, M, N
DOUBLE PRECISION A( LDA, * ), TAU( * ), WORK( * )
PURPOSE
DORG2L generates an m by n real matrix Q with orthonormal columns, which is defined as the
last n columns of a product of k elementary reflectors of order m
Q = H(k) . . . H(2) H(1)
as returned by DGEQLF.
ARGUMENTS
M (input) INTEGER
The number of rows of the matrix Q. M >= 0.
N (input) INTEGER
The number of columns of the matrix Q. M >= N >= 0.
K (input) INTEGER
The number of elementary reflectors whose product defines the matrix Q. N >= K >=
0.
A (input/output) DOUBLE PRECISION array, dimension (LDA,N)
On entry, the (nk+i)th column must contain the vector which defines the elemen
tary reflector H(i), for i = 1,2,...,k, as returned by DGEQLF in the last k col
umns of its array argument A. On exit, the m by n matrix Q.
LDA (input) INTEGER
The first dimension of the array A. LDA >= max(1,M).
TAU (input) DOUBLE PRECISION array, dimension (K)
TAU(i) must contain the scalar factor of the elementary reflector H(i), as
returned by DGEQLF.
WORK (workspace) DOUBLE PRECISION array, dimension (N)
INFO (output) INTEGER
= 0: successful exit
< 0: if INFO = i, the ith argument has an illegal value
LAPACK version 3.0 15 June 2000 DORG2L(l) 
