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

SLARF(l)					)					 SLARF(l)

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

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

	   CHARACTER	 SIDE

	   INTEGER	 INCV, LDC, M, N

	   REAL 	 TAU

	   REAL 	 C( LDC, * ), V( * ), WORK( * )

PURPOSE
       SLARF 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) REAL 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) REAL
	       The value tau in the representation of H.

       C       (input/output) REAL 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'.

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

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

LAPACK version 3.0			   15 June 2000 				 SLARF(l)


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