Conversion: Algebraic - Polish - Reverse Polish - LISP ?

[Thomas Klemm]

A little shorter:

Code:

«
  IF DUP TYPE 9 SAME
  THEN OBJ→ → f
    « →LIST 1
      « →PN
      » DOLIST f SWAP +
    »
  END
»

I am not aware of any algebraic expression that ends with an empty list when OBJ→ is called on it. In such a case, the following DOLIST will fail.