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RedHat 9 (Linux i386) - man page for zung2r (redhat section l)

ZUNG2R(l)					)					ZUNG2R(l)

NAME
       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 orthonormal 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  elementary 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 illegal value

LAPACK version 3.0			   15 June 2000 				ZUNG2R(l)


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