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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.

