Re: [Maxima-discuss] error in lisp program for maxima

[Robert D. <rob...@gm...>]

On 2014-06-22, Pankaj Sejwal <pan...@gm...> wrote:

> (defun $concat (lis)
>    (cons '(mlist) (apply #'concatenate 'list (rest lis))))

> it just hangs for no apparent reason. I tried with "to_lisp()" to but it
> also hangs and never comes to maxim​a mode after it.

Well, if you :lisp (setq *debugger-hook* nil) before that and then
hit ctrl-C when it is apparently hanging, you should get a Lisp
debugger prompt. Some varieties of Lisp will give you a stack trace --
e.g. in Clisp, the command is just "backtrace". You can look at the
stack trace to see where it is stuck.

I seem to recall GCL gives much less useful info in a stack trace
than other Lisps. If you are interesting in Lisp hacking, maybe
switch to another variety (e.g. Clisp, SBCL, Clozure CL, etc).

But maybe you can skip all that -- isn't the existing function 'append'
what you are trying to implement here? Btw there is already a function
'concat' which probably has a different effect ...

best

Robert Dodier