[Maxima] Integral lookup and CLISP
Billinghurst, David (RTATECH)
David.Billinghurst at riotinto.com
Sun Jan 4 17:19:12 CST 2009
> From: Dieter Kaiser
> CLISP has a problem with the routine to lookup the integrals
> for the Bessel functions. The following code is the reason:
> ;; If form is a function then evaluate it with actual args
> (or (not (functionp form))
> (setq form (apply form real-args))))
> In CLISP the expression (functionp (lambda (x y) ... )) gives
> always NIL and not T as is expected. The evaluation is not
> done and later in the code we get an Lisp Error with the
> unevaluated lambda expression.
> For GCL the test with functionp works.
> Dieter Kaiser
I can reproduce this with CLISP 2.46 on cygwin, and I think that
CLISP is correct.
The common lisp hyperspec for FUNCTIONP gives as examples:
(functionp '(lambda (x) (* x x))) => false
(functionp #'(lambda (x) (* x x))) => true
CLISP conforms, but gcl gives true in both cases.
I need to read up on this some more. Suggestions/patches welcome.
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