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dlarfx (3)
  • >> dlarfx (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         dlarfx - apply 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( * )
    
    
    
         #include <sunperf.h>
    
         void dlarfx(char side, int m, int n, double *v, double  tau,
                   double *dc, int ldc) ;
    
    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 represen-
                   tation 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.
    
    
    
    


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