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NAME
     zungr2 - generate an m by n complex matrix Q with  orthonor-
     mal rows,

SYNOPSIS
     SUBROUTINE ZUNGR2( M, N, K, A, LDA, TAU, WORK, INFO )

     INTEGER INFO, K, LDA, M, N

     COMPLEX*16 A( LDA, * ), TAU( * ), WORK( * )



     #include <sunperf.h>

     void zungr2(int m, int n, int k, doublecomplex *za, int lda,
               doublecomplex *tau, int *info) ;

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(2)' . . . H(k)'

     as returned by ZGERQF.


ARGUMENTS
     M         (input) INTEGER
               The number of rows of the matrix Q. M >= 0.

     N         (input) INTEGER
               The number of columns of the matrix Q. N >= M.

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

     A         (input/output) COMPLEX*16 array, dimension (LDA,N)
               On entry, the (m-k+i)-th row must contain the vec-
               tor  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       (input) INTEGER
               The  first  dimension  of  the  array  A.  LDA  >=
               max(1,M).

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

     WORK      (workspace) COMPLEX*16 array, dimension (M)

     INFO      (output) INTEGER
               = 0: successful exit
               < 0: if INFO = -i, the i-th argument has an  ille-
               gal value

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