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slarfg (3)
  • >> slarfg (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         slarfg - generate a real elementary reflector H of order  n,
         such that   H * ( alpha ) = ( beta ), H' * H = I
    
    SYNOPSIS
         SUBROUTINE SLARFG( N, ALPHA, X, INCX, TAU )
    
         INTEGER INCX, N
    
         REAL ALPHA, TAU
    
         REAL X( * )
    
    
    
         #include <sunperf.h>
    
         void slarfg(int n, float *salpha, float *sx, int incx, float
                   *tau) ;
    
    PURPOSE
         SLARFG generates a real elementary reflector H of  order  n,
         such that
                   (   x   )   (   0  )
    
         where alpha and beta are scalars, and x is an  (n-1)-element
         real vector. H is represented in the form
    
               H = I - tau * ( 1 ) * ( 1 v' ) ,
                             ( v )
    
         where tau is a real scalar and v is a real (n-1)-element
         vector.
    
         If the elements of x are all zero, then tau =  0  and  H  is
         taken to be the unit matrix.
    
         Otherwise  1 <= tau <= 2.
    
    
    ARGUMENTS
         N         (input) INTEGER
                   The order of the elementary reflector.
    
         ALPHA     (input/output) REAL
                   On  entry,  the  value  alpha.   On  exit,  it  is
                   overwritten with the value beta.
    
         X         (input/output) REAL array, dimension
                   (1+(N-2)*abs(INCX)) On entry, the  vector  x.   On
                   exit, it is overwritten with the vector v.
    
         INCX      (input) INTEGER
                   The increment between elements of X. INCX > 0.
    
         TAU       (output) REAL
                   The value tau.
    
    
    
    


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