zung2l.f(3) LAPACK zung2l.f(3)
subroutine zung2l (M, N, K, A, LDA, TAU, WORK, INFO)
ZUNG2L generates all or part of the unitary matrix Q from a QL factorization
determined by cgeqlf (unblocked algorithm).
subroutine zung2l (integerM, integerN, integerK, complex*16, dimension( lda, * )A, integerLDA,
complex*16, dimension( * )TAU, complex*16, dimension( * )WORK, integerINFO)
ZUNG2L generates all or part of the unitary matrix Q from a QL factorization determined by
cgeqlf (unblocked algorithm).
ZUNG2L generates an m by n complex 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 ZGEQLF.
M is INTEGER
The number of rows of the matrix Q. M >= 0.
N is INTEGER
The number of columns of the matrix Q. M >= N >= 0.
K is INTEGER
The number of elementary reflectors whose product defines the
matrix Q. N >= K >= 0.
A is COMPLEX*16 array, dimension (LDA,N)
On entry, the (n-k+i)-th column must contain the vector which
defines the elementary reflector H(i), for i = 1,2,...,k, as
returned by ZGEQLF in the last k columns of its array
On exit, the m-by-n matrix Q.
LDA is INTEGER
The first dimension of the array A. LDA >= max(1,M).
TAU is COMPLEX*16 array, dimension (K)
TAU(i) must contain the scalar factor of the elementary
reflector H(i), as returned by ZGEQLF.
WORK is COMPLEX*16 array, dimension (N)
INFO is INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument has an illegal value
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
Definition at line 115 of file zung2l.f.
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 zung2l.f(3)