Re: Changing printing of rationals

> So I'm wondering whether there is a way (ideally portable, but I can live with
> Lispworks-specific) to change printing of rationals?  It's for interactive
> development use only, although I'd probably choose an output format allowing me
> to read the printed values back in correctly just in case I want use output for
> input (say §R[36314/6525:5.56536])...

You could mess around with the pretty print dispatch tables.


Example.
(defparameter *my-dispatch* (copy-pprint-dispatch nil))

(set-pprint-dispatch 'ratio
                     #'(lambda (stream object)
                         (format stream "§R[~A/~A ~A]" (numerator object)
                                 (denominator object) (float object)))
                     0
                     *my-dispatch*)

(let ((*print-pprint-dispatch* *my-dispatch*))
  (pprint 1/2))

=> §R[1/2 0.5]



Sean.