Re: How could I modify list element?

[Alan Mackenzie]

On Tue, 9 Dec 2008, richardeng wrote:

> Hi all,
>    setcar/setcdr is not convenient.
>    In a long list, ex.
>    (setq a '(a b c d e f g))
>    I want to change 'e to 'E.
>    I need a function: (set-list-elt list old-elt new-elt)
>
>    How? translate list to vector, modify, then turn it back???

Try this (not tested):

(defun change-nth (liszt, n, nieuw)
  (while (> n 0)
    (setq liszt (cdr liszt)
          n (1- n)))
  (if liszt
     (setcar liszt nieuw)))

--
Alan Mackenzie (Nuremberg, Germany).