CXML
        	    
LAPACK version 3.0
zunmql(3)

PURPOSE
  ZUNMQL - overwrite the general complex M-by-N matrix C with  SIDE = 'L'
  SIDE = 'R' TRANS = 'N'

SYNTAX
  SUBROUTINE ZUNMQL( SIDE, TRANS, M, N, K, A, LDA, TAU, C, LDC, WORK, LWORK,
		     INFO )

      CHARACTER	     SIDE, TRANS

      INTEGER	     INFO, K, LDA, LDC, LWORK, M, N

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

DESCRIPTION
  ZUNMQL overwrites the general complex M-by-N matrix C with SIDE = 'L' SIDE
  = 'R' TRANS = 'N': Q * C C * Q TRANS = 'C':	   Q**H * C	  C * Q**H

  where Q is a complex unitary matrix defined as the product of k elementary
  reflectors

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

  as returned by ZGEQLF. Q is of order M if SIDE = 'L' and of order N if SIDE
  = 'R'.

ARGUMENTS
  SIDE	  (input) CHARACTER*1
	  = 'L': apply Q or Q**H from the Left;
	  = 'R': apply Q or Q**H from the Right.

  TRANS	  (input) CHARACTER*1
	  = 'N':  No transpose, apply Q;
	  = 'C':  Transpose, apply Q**H.

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

  N	  (input) INTEGER
	  The number of columns of the matrix C. N >= 0.

  K	  (input) INTEGER
	  The number of elementary reflectors whose product defines the
	  matrix Q.  If SIDE = 'L', M >= K >= 0; if SIDE = 'R', N >= K >= 0.

  A	  (input) COMPLEX*16 array, dimension (LDA,K)
	  The 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.  A is modified by
	  the routine but restored on exit.

  LDA	  (input) INTEGER
	  The leading dimension of the array A.	 If SIDE = 'L', LDA >=
	  max(1,M); if SIDE = 'R', LDA >= max(1,N).

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

  C	  (input/output) COMPLEX*16 array, dimension (LDC,N)
	  On entry, the M-by-N matrix C.  On exit, C is overwritten by Q*C or
	  Q**H*C or C*Q**H or C*Q.

  LDC	  (input) INTEGER
	  The leading dimension of the array C. LDC >= max(1,M).

  WORK	  (workspace/output) COMPLEX*16 array, dimension (LWORK)
	  On exit, if INFO = 0, WORK(1) returns the optimal LWORK.

  LWORK	  (input) INTEGER
	  The dimension of the array WORK.  If SIDE = 'L', LWORK >= max(1,N);
	  if SIDE = 'R', LWORK >= max(1,M).  For optimum performance LWORK >=
	  N*NB if SIDE = 'L', and LWORK >= M*NB if SIDE = 'R', where NB is
	  the optimal blocksize.

	  If LWORK = -1, then a workspace query is assumed; the routine only
	  calculates the optimal size of the WORK array, returns this value
	  as the first entry of the WORK array, and no error message related
	  to LWORK is issued by XERBLA.

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