dlarf man page on IRIX

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DLARF(3F)							     DLARF(3F)

NAME
     DLARF - applie a real elementary reflector H to a real m by n matrix C,
     from either the left or the right

SYNOPSIS
     SUBROUTINE DLARF( SIDE, M, N, V, INCV, TAU, C, LDC, WORK )

	 CHARACTER     SIDE

	 INTEGER       INCV, LDC, M, N

	 DOUBLE	       PRECISION TAU

	 DOUBLE	       PRECISION C( LDC, * ), V( * ), WORK( * )

PURPOSE
     DLARF applies a real elementary reflector H to a real m by n matrix C,
     from either the left or the right. H is represented in the form

	   H = I - tau * v * v'

     where tau is a real scalar and v is a real vector.

     If tau = 0, then H is taken to be the unit matrix.

ARGUMENTS
     SIDE    (input) CHARACTER*1
	     = 'L': form  H * C
	     = 'R': form  C * H

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

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

     V	     (input) DOUBLE PRECISION array, dimension
	     (1 + (M-1)*abs(INCV)) if SIDE = 'L' or (1 + (N-1)*abs(INCV)) if
	     SIDE = 'R' The vector v in the representation of H. V is not used
	     if TAU = 0.

     INCV    (input) INTEGER
	     The increment between elements of v. INCV <> 0.

     TAU     (input) DOUBLE PRECISION
	     The value tau in the representation of H.

     C	     (input/output) DOUBLE PRECISION array, dimension (LDC,N)
	     On entry, the m by n matrix C.  On exit, C is overwritten by the
	     matrix H * C if SIDE = 'L', or C * H if SIDE = 'R'.

									Page 1

DLARF(3F)							     DLARF(3F)

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

     WORK    (workspace) DOUBLE PRECISION array, dimension
	     (N) if SIDE = 'L' or (M) if SIDE = 'R'

									Page 2

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