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dlarfx examples
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Man Page Details
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NAME
       DLARFX  - a real elementary reflector H to a real m by n matrix C, from
       either the left or the right

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

           CHARACTER      SIDE

           INTEGER        LDC, M, N

           DOUBLE         PRECISION TAU

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

PURPOSE
       DLARFX 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

       This version uses inline code if H has order < 11.


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 (M) if SIDE = 'L'
               or (N) if SIDE = 'R' The vector v in the representation of H.

       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'.

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

       WORK    (workspace) DOUBLE PRECISION array, dimension
               (N) if SIDE = 'L' or (M) if SIDE = 'R' WORK is  not  referenced
               if H has order < 11.

