topic Re: Lisp loop function not found in Visual LISP, AutoLISP and General Customization Forum

Lisp loop function not found

Anonymous — Sun, 18 Feb 2018 00:11:20 GMT

I am trying to make my first loop and for some reason this is not working:

(loop for x from 1 to 10 do
(prompt "ASDASD")
(terpri)
)

; error: no function definition: LOOP

Re: Lisp loop function not found

devitg — Sun, 18 Feb 2018 01:07:54 GMT

(setq count 1)
(While (< count 11)



(prompt (strcat "\n" (itoa count) "   asdas   "))

(setq count (1+ count))

)

;;;1   asdas
;;;2   asdas
;;;3   asdas
;;;4   asdas
;;;5   asdas
;;;6   asdas
;;;7   asdas
;;;8   asdas
;;;9   asdas
;;;10   asdas

Re: Lisp loop function not found

Kent1Cooper — Sun, 18 Feb 2018 01:23:27 GMT

@Anonymous wrote:

....
(loop for x from 1 to 10 do
(prompt "ASDASD")
(terpri)
)

; error: no function definition: LOOP

The error message says it all -- that's not an AutoLisp function. In addition to the (while) function already suggested, depending on the circumstances you could also use (repeat). If you really want the same prompt ten times as your example suggests:

(repeat 10

(prompt "ASDASD")

)

Re: Lisp loop function not found

martti.halminen — Mon, 19 Feb 2018 10:19:28 GMT

The problem here is that you have been reading something about Common Lisp . The LOOP macro exists there, but not in AutoLISP/Visual Lisp.

While reading CL materials will probably teach you a better programming style than the stuff from Autodesk, there are large differences between the languages. Back when there used to be printed documentation, the part about AutoLISP was about 66 pages. A book about CL (CLtL2) has an index of 60 pages, the book is about a thousand pages...

AutoLISP has 6 built-in datatypes, IIRC, CL has 17.

So, the low-level list manipulation is the same, but most of the more powerful constructs in CL don't exist in AutoLISP.