Replace an item in a list in Common Lisp?

Question

I have a list of things (I\'ll call it L), an index(N) and a new thing(NEW). If I want to replace the thing in L at N with NEW, what is the best way to do this? Should I get the

Answer 1

Sounds like you want either rplaca or replace. See http://www.lispworks.com/documentation/HyperSpec/Body/f_rplaca.htm or http://www.lispworks.com/documentation/HyperSpec/Body/f_replac.htm#replace