loop with different variables

[ole]

Hi,

I just discovered that I can use setf to place an element inside a list:

(setq numbers '(1 2 3 4 5 6))
(setf (nth 5 numbers) 99)
numbers
-->(1 2 3 4 5 99)
(setf (nth 1 numbers) 55)
numbers
-->(1 55 3 4 5 99)

So I need to write a function who is working through two lists in parallel (place of the new item (nth number) and value of the new item). How can I do that?

thanks!

ole

[pstone imap]

Try this:

(setq numbers '(1 2 3 4 5 6))

(mapcar #'(lambda (x y)
            (setf (nth x numbers) y))
        '(5 1)
        '(99 55))

numbers
--> (1 55 3 4 5 99)

Peter

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[ole]

Thanks! That is very very close to what I figured out myself- I'am still looking for sources to become better in lisp, so if you have any recommandations- I would also buy a book or following a course..

ole