CXML
        	    
LAPACK version 3.0
zung2l(3)

PURPOSE
  ZUNG2L - generate an m by n complex matrix Q with orthonormal columns,

SYNTAX
  SUBROUTINE ZUNG2L( M, N, K, A, LDA, TAU, WORK, INFO )

      INTEGER	     INFO, K, LDA, M, N

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

DESCRIPTION
  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.

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 (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	  (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 ZGEQLF.

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

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