zungl2 (3) Linux Manual Page

zungl2.f –

Synopsis

Functions/Subroutines

subroutine zungl2 (M, N, K, A, LDA, TAU, WORK, INFO)
ZUNGL2 generates all or part of the unitary matrix Q from an LQ factorization determined by cgelqf (unblocked algorithm).

Function/Subroutine Documentation

subroutine zungl2 (integerM, integerN, integerK, complex*16, dimension( lda, * )A, integerLDA, complex*16, dimension( * )TAU, complex*16, dimension( * )WORK, integerINFO)

ZUNGL2 generates all or part of the unitary matrix Q from an LQ factorization determined by cgelqf (unblocked algorithm).

Purpose:

 ZUNGL2 generates an m-by-n complex matrix Q with orthonormal rows,
 which is defined as the first m rows of a product of k elementary
 reflectors of order n
 Q = H(k)**H . . . H(2)**H H(1)**H
 as returned by ZGELQF.

 

Parameters:

M

 M is INTEGER
 The number of rows of the matrix Q. M >= 0.

N

 N is INTEGER
 The number of columns of the matrix Q. N >= M.

K

 K is INTEGER
 The number of elementary reflectors whose product defines the
 matrix Q. M >= K >= 0.

A

 A is COMPLEX*16 array, dimension (LDA,N)
 On entry, the i-th row must contain the vector which defines
 the elementary reflector H(i), for i = 1,2,...,k, as returned
 by ZGELQF in the first k rows of its array argument A.
 On exit, the m by n matrix Q.

LDA

 LDA is INTEGER
 The first dimension of the array A. LDA >= max(1,M).

TAU

 TAU is COMPLEX*16 array, dimension (K)
 TAU(i) must contain the scalar factor of the elementary
 reflector H(i), as returned by ZGELQF.

WORK

 WORK is COMPLEX*16 array, dimension (M)

INFO

 INFO is INTEGER
 = 0: successful exit
 < 0: if INFO = -i, the i-th 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 114 of file zungl2.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.