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From: flowers@ucla-cs.UUCP
Newsgroups: comp.lang.lisp
Subject: Re: Circular Lists - (nf)
Message-ID: <5044@shemp.ucla-cs.UCLA.EDU>
Date: Sat, 14-Mar-87 20:39:19 EST
Article-I.D.: shemp.5044
Posted: Sat Mar 14 20:39:19 1987
Date-Received: Sun, 15-Mar-87 07:38:52 EST
References: <2700001@uicsg.UUCP> <6900003@iaoobelix.UUCP>
Sender: root@ucla-cs.UCLA.EDU
Reply-To: flowers@CS.UCLA.EDU (Margot Flowers)
Organization: UCLA Computer Science Department
Lines: 11

In article <6900003@iaoobelix.UUCP> wagner@iaoobelix.UUCP writes:

>I think, there are two major applications of circular lists:
>
>1. Infinite lists. Under some circumstances (map...) it is useful to have
>	a list containing a periodic sequence of objects. This (circular)
>	list can then be used e.g. in mapcar to apply a function to an
>	infinite (but periodic) sequence of data objects.

Infinite lists are more appriately embodied in streams (see
Abelson&Sussman 3.4).