SRC/zung2l.f(3)            Library Functions Manual            SRC/zung2l.f(3)

NAME
       SRC/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 (integer m, integer n, integer k, complex*16, dimension(
       lda, * ) a, integer lda, complex*16, dimension( * ) tau, complex*16,
       dimension( * ) work, integer info)
       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.
           !>

           N

           !>          N is INTEGER
           !>          The number of columns of the matrix Q. M >= N >= 0.
           !>

           K

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

           A

           !>          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
           !>          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 ZGEQLF.
           !>

           WORK

           !>          WORK is COMPLEX*16 array, dimension (N)
           !>

           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 zung2l.f.

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

LAPACK                          Version 3.12.0                 SRC/zung2l.f(3)