IZMAX1 - find the index of the element whose real part has
       maximum absolute value


SYNOPSIS

       INTEGER FUNCTION IZMAX1( N, CX, INCX )

           INTEGER      INCX, N

           COMPLEX*16   CX( * )


PURPOSE

       IZMAX1 finds the index of the element whose real part  has
       maximum  absolute  value.   Based  on  IZAMAX from 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
               >= 1.


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