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dzsum1

 NAME
      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.