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LAPACK version 3.0
zungr2(3)

PURPOSE
  ZUNGR2 - generate an m by n complex matrix Q with orthonormal rows,

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

      INTEGER	     INFO, K, LDA, M, N

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

DESCRIPTION
  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 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	  (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 illegal value