Eamon Millman <mattimeo@waimea.hawaiian.net> wrote:
+---------------
| Well... using the first goodie for our Lab2 it dosn't work in Dr.Scheme...
...
| I attemped to load the 'subst.scm' goodie into Dr. Scheme...
| (-1+ n)))))) with "Reference to undefined identifier: -1+"
| so i'm unable to use this goodie in Dr. Scheme...
+---------------

Sounds like you're missing some prerequisite library file, that your
instructor probably put together, that contains a bunch of non-standard
extensions such as "-1+". I can give you a usable workaround for that here:

	(define (-1+ x) (+ x -1))

or equivalently:

	(define (-1+ x) (- x 1))

but I suspect you'll quickly run into another one... and another...
unless you find your instructor's base library and load it first.


-Rob

-----
Rob Warnock, 31-2-510		rpw3@sgi.com
SGI Network Engineering		http://reality.sgi.com/rpw3/
1600 Amphitheatre Pkwy.		Phone: 650-933-1673
Mountain View, CA  94043	PP-ASEL-IA