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RedHat 9 (Linux i386) - man page for zungl2 (redhat section l)

ZUNGL2(l)					)					ZUNGL2(l)

NAME
       ZUNGL2 - generate an m-by-n complex matrix Q with orthonormal rows,

SYNOPSIS
       SUBROUTINE ZUNGL2( M, N, K, A, LDA, TAU, WORK, INFO )

	   INTEGER	  INFO, K, LDA, M, N

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

PURPOSE
       ZUNGL2 generates an m-by-n complex matrix Q with orthonormal rows, which is defined as the
       first m rows of a product of k elementary reflectors of order n

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

       as returned by ZGELQF.

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	i-th  row  must  contain  the vector which defines the elementary
	       reflector H(i), for i = 1,2,...,k, as returned by ZGELQF in the first  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 ZGELQF.

       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

LAPACK version 3.0			   15 June 2000 				ZUNGL2(l)


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