DZSUM1  - take the sum of the absolute values of a complex
       vector and returns a double precision result


SYNOPSIS

       DOUBLE PRECISION FUNCTION DZSUM1( N, CX, INCX )

           INTEGER      INCX, N

           COMPLEX*16   CX( * )


PURPOSE

       DZSUM1 takes the sum of the absolute values of  a  complex
       vector  and  returns  a double precision result.  Based on
       DZASUM from the Level 1 BLAS.
       The change is to use the 'genuine' absolute value.

       Contributed by Nick Higham for use with ZLACON.


ARGUMENTS

       N       (input) INTEGER
               The number of elements in the vector CX.

       CX      (input) COMPLEX*16 array, dimension (N)
               The vector whose elements will be summed.

       INCX    (input) INTEGER
               The spacing between successive values of CX.  INCX
               > 0.


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