zungr2.f(3) LAPACK zungr2.f(3)
subroutine zungr2 (M, N, K, A, LDA, TAU, WORK, INFO)
ZUNGR2 generates all or part of the unitary matrix Q from an RQ factorization
determined by cgerqf (unblocked algorithm).
subroutine zungr2 (integerM, integerN, integerK, complex*16, dimension( lda, * )A, integerLDA,
complex*16, dimension( * )TAU, complex*16, dimension( * )WORK, integerINFO)
ZUNGR2 generates all or part of the unitary matrix Q from an RQ factorization determined
by cgerqf (unblocked algorithm).
ZUNGR2 generates an m by n complex matrix Q with orthonormal rows,
which is defined as the last m rows of a product of k elementary
reflectors of order n
Q = H(1)**H H(2)**H . . . H(k)**H
as returned by ZGERQF.
M is INTEGER
The number of rows of the matrix Q. M >= 0.
N is INTEGER
The number of columns of the matrix Q. N >= M.
K is INTEGER
The number of elementary reflectors whose product defines the
matrix Q. M >= K >= 0.
A is COMPLEX*16 array, dimension (LDA,N)
On entry, the (m-k+i)-th row must contain the vector which
defines the elementary reflector H(i), for i = 1,2,...,k, as
returned by ZGERQF in the last k rows of its array argument
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 ZGERQF.
WORK is COMPLEX*16 array, dimension (M)
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 zungr2.f.
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 zungr2.f(3)