ZUNG2R  -  generate  an  m  by  n  complex  matrix  Q with
       orthonormal columns,


SYNOPSIS

       SUBROUTINE ZUNG2R( M, N, K, A, LDA, TAU, WORK, INFO )

           INTEGER        INFO, K, LDA, M, N

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


PURPOSE

       ZUNG2R generates an m by n complex matrix Q with orthonor­
       mal  columns, which is defined as the first n columns of a
       product of k elementary reflectors of order m

             Q  =  H(1) H(2) . . . H(k)

       as returned by ZGEQRF.


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. M >=  N  >=
               0.

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

       A       (input/output) COMPLEX*16 array, dimension (LDA,N)
               On  entry, the i-th column must contain the vector
               which defines the elementary reflector H(i), for i
               =  1,2,...,k, as returned by ZGEQRF in the first k
               columns 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  ele­
               mentary reflector H(i), as returned by ZGEQRF.

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

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


Man(1) output converted with man2html