zung2l.f (3)  Linux Manuals
NAME
zung2l.f 
SYNOPSIS
Functions/Subroutines
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).
Function/Subroutine Documentation
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).
Purpose:

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.
Parameters:

M
M is INTEGER The number of rows of the matrix Q. M >= 0.
NN is INTEGER The number of columns of the matrix Q. M >= N >= 0.
KK is INTEGER The number of elementary reflectors whose product defines the matrix Q. N >= K >= 0.
AA is COMPLEX*16 array, dimension (LDA,N) On entry, the (nk+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 argument A. On exit, the mbyn matrix Q.
LDALDA is INTEGER The first dimension of the array A. LDA >= max(1,M).
TAUTAU is COMPLEX*16 array, dimension (K) TAU(i) must contain the scalar factor of the elementary reflector H(i), as returned by ZGEQLF.
WORKWORK is COMPLEX*16 array, dimension (N)
INFOINFO is INTEGER = 0: successful exit < 0: if INFO = i, the ith argument has an illegal value
Author:

Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
 September 2012
Definition at line 115 of file zung2l.f.
Author
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