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zlassq examples
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Man Page Details
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NAME
       ZLASSQ  - the values scl and ssq such that   ( scl**2 )*ssq = x( 1 )**2
       +...+ x( n )**2 + ( scale**2 )*sumsq,

SYNOPSIS
       SUBROUTINE ZLASSQ( N, X, INCX, SCALE, SUMSQ )

           INTEGER        INCX, N

           DOUBLE         PRECISION SCALE, SUMSQ

           COMPLEX*16     X( * )

PURPOSE
       ZLASSQ 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 respectively.
       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) COMPLEX*16 array, dimension (N)
               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) DOUBLE PRECISION
               On entry, the value  scale  in the equation  above.   On  exit,
               SCALE is overwritten with the value  scl .

       SUMSQ   (input/output) DOUBLE PRECISION
               On  entry,  the  value  sumsq  in the equation above.  On exit,
               SUMSQ is overwritten with the value  ssq .

