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classq (3)
  • >> classq (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         classq - return the values scl and ssq such that   (  scl**2
         )*ssq = x( 1 )**2 +...+ x( n )**2 + ( scale**2 )*sumsq,
    
    SYNOPSIS
         SUBROUTINE CLASSQ( N, X, INCX, SCALE, SUMSQ )
    
         INTEGER INCX, N
    
         REAL SCALE, SUMSQ
    
         COMPLEX X( * )
    
    
    
         #include <sunperf.h>
    
         void classq(int n, complex x, int incx, float *sscale, float
                   *sumsq) ;
    
    PURPOSE
         CLASSQ returns the values scl and ssq such that
    
         where x( i ) = abs( X( 1 + ( i - 1 )*INCX ) ). The value  of
         sumsq  is  assumed to be at least unity and the value of ssq
         will then satisfy
    
            1.0 .le. ssq .le. ( sumsq + 2*n ).
    
         scale is assumed to be  non-negative  and  scl  returns  the
         value
    
            scl = max( scale, abs( real( x( i ) ) ), abs( aimag( x( i
         ) ) ) ),
                   i
    
         scale and sumsq must be supplied in SCALE and SUMSQ  respec-
         tively.   SCALE  and  SUMSQ  are  overwritten by scl and ssq
         respectively.
    
         The routine makes only one pass through the vector X.
    
    
    ARGUMENTS
         N         (input) INTEGER
                   The number of elements to be used from the  vector
                   X.
    
         X         (input) REAL
                   The vector x as described above.  x( i )  = X( 1 +
                   ( i - 1 )*INCX ), 1 <= i <= n.
    
         INCX      (input) INTEGER
                   The increment between  successive  values  of  the
                   vector X.  INCX > 0.
    
         SCALE     (input/output) REAL
                   On entry, the value  scale  in the equation above.
                   On  exit, SCALE is overwritten with the value  scl
                   .
    
         SUMSQ     (input/output) REAL
                   On entry, the value  sumsq  in the equation above.
                   On  exit, SUMSQ is overwritten with the value  ssq
                   .
    
    
    
    


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