DORGR2 man page on IRIX

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DORGR2(3F)							    DORGR2(3F)

NAME
     DORGR2 - generate an m by n real matrix Q with orthonormal rows,

SYNOPSIS
     SUBROUTINE DORGR2( M, N, K, A, LDA, TAU, WORK, INFO )

	 INTEGER	INFO, K, LDA, M, N

	 DOUBLE		PRECISION A( LDA, * ), TAU( * ), WORK( * )

PURPOSE
     DORGR2 generates an m by n real 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 DGERQF.

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) DOUBLE PRECISION 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 DGERQF 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) DOUBLE PRECISION array, dimension (K)
	     TAU(i) must contain the scalar factor of the elementary reflector
	     H(i), as returned by DGERQF.

     WORK    (workspace) DOUBLE PRECISION array, dimension (M)

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

									Page 1

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