LispForum

Error messages don't always list the function where an error occured. How do I find this information?

You're right, and I'm in the wrong section(lisp). Mods, feel free to move or delete.

Why am I getting this error from running "contains": "EVAL: undefined function MOVE-X"? (defstruct move state previous f g h) (defun contains (list x) (let ((found nil)) (loop for y in list when (equal (move-x state) (move-y state)) return y))) TEST CODE (setf x (make-move :state...

Brainfart

I found it. I have one too many parenthesis after do.

The thing is, shouldn't I put the sequence of functions into one s-expression block like let does?

(defun manhatten-distance (state) (let ((index 0) (total 0) (current 0) (cvalue 0) (rvalue 0)) (loop for i from 0 to 8 do ((setf current (nth i state)))))) SYSTEM::%EXPAND-FORM: (SETF CURRENT (NTH I STATE)) should be a lambda expression [Condition of type SYSTEM::SIMPLE-SOURCE-PROGRAM-ERROR] Why am...

Yeah, that fixes it. I think I was putting my variables in parentheses.

edit: grammar

If I want to return a list or nil how do I do that? If I just try to put the name of the list or nil on the last line, lisp tells me it's not a function. I've been using the print function but that isn't going to cut it anymore. For example (defun goalp (state) (let ((x state)) (loop for i from 0 to...

Thanks, I think I'm starting to get this functional programming thingamajig.

Are functions also considered objects?

Am I to think of these objects as instances of the syntax tree? I'm not sure how this part of the construct works.