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Message from discussion data hygiene [Re: Why is Scheme not a Lisp?]
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Rahul Jain  
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 More options Mar 23 2002, 2:00 pm
Newsgroups: comp.lang.lisp
From: Rahul Jain <rj...@sid-1129.sid.rice.edu>
Date: 23 Mar 2002 12:53:27 -0600
Local: Sat, Mar 23 2002 1:53 pm
Subject: Re: data hygiene [Re: Why is Scheme not a Lisp?]
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ktakk...@cc.helsinki.fi (Kimmo T Takkunen) writes:

> When reading this it occurred to me that there may be people out there
> who actually need maximum speed on assoc-lists.

> If there are, have you been experimenting with heuristic access
> methods? Ron Rivest has analyzed two of them (MTF and TRANS) in [1].

Why not use a tree-based approach for larger set-sizes? That's why
they were developed, after all. If you don't have a total ordering for
the key set you can try ordering based on hashes of the
keys. Something like a hash-B-tree or a hash-splay-tree.

--
-> -/                        - Rahul Jain -                        \- <-
-> -\  http://linux.rice.edu/~rahul -=-  mailto:rj...@techie.com   /- <-
-> -/ "Structure is nothing if it is all you got. Skeletons spook  \- <-
-> -\  people if [they] try to walk around on their own. I really  /- <-
-> -/  wonder why XML does not." -- Erik Naggum, comp.lang.lisp    \- <-
|--|--------|--------------|----|-------------|------|---------|-----|-|
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