Subject: Re: Speed, Faster... Faster... Slower? From: Erik Naggum <erik@naggum.no> Date: 2000/01/18 Newsgroups: comp.lang.lisp Message-ID: <3157208830761229@naggum.no> * Tony <TonyNOToSPAM@chice.force9.co.uk.invalid> | Some of the data is contained in simple-vectors, other bits | in arrays, within the structures, but the use of arrays is | wastefull in this situation as the ultimate size is unknown. well, you _could_ use adjustable vectors with fill pointers if such is your concern. Common Lisp knows that the tradeoff that people made with lists carried a performance penalty. look at VECTOR-PUSH and VECTOR-POP for ways to deal with unknown sizes and still get O(1) access times. #:Erik