SRC/zungr2.f(3)            Library Functions Manual            SRC/zungr2.f(3)

NAME
       SRC/zungr2.f

SYNOPSIS
   Functions/Subroutines
       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).

Function/Subroutine Documentation
   subroutine zungr2 (integer m, integer n, integer k, complex*16, dimension(
       lda, * ) a, integer lda, complex*16, dimension( * ) tau, complex*16,
       dimension( * ) work, integer info)
       ZUNGR2 generates all or part of the unitary matrix Q from an RQ
       factorization determined by cgerqf (unblocked algorithm).

       Purpose:


            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.

       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 (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
                     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 ZGERQF.

           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.

       Definition at line 113 of file zungr2.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0                 SRC/zungr2.f(3)