From: skaller <skaller@maxtal.com.au>
To: Lyn A Headley <laheadle@cs.uchicago.edu>
Cc: Pierre Weis <Pierre.Weis@inria.fr>, caml-list@inria.fr
Subject: Re: Data structures in ocaml
Date: Wed, 13 Oct 1999 04:52:37 +1000 [thread overview]
Message-ID: <38038375.4D58AFC3@maxtal.com.au> (raw)
In-Reply-To: <19991011053733.76BC3120@yeenoghu.cs.uchicago.edu>
Lyn A Headley wrote:
> Python "lists" are based on arrays, so I believe the performance is as
> follows (some of these functions don't really exists, but would be
> "faked" using slices or somesuch):
> append_lists([l1, l2, ... ln]) not sure if this exists. The naive
> implementation using "+" would be quadratic.
That's an interesting observation: thanks for pointing it
out. In fact, expressions like
x = a + b + c + d
are common manipulating strings in Python. Because I represent this
as a list, _not_ recursively, I can get linear performance,
if there is a way to preallocate the storage. [I can't remember
off hand if the 'Buffer' class allows this]. I can also do it
for (python) lists, using Varray.
--
John Skaller, mailto:skaller@maxtal.com.au
1/10 Toxteth Rd Glebe NSW 2037 Australia
homepage: http://www.maxtal.com.au/~skaller
downloads: http://www.triode.net.au/~skaller
prev parent reply other threads:[~1999-10-13 6:59 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-10-06 18:50 skaller
1999-10-07 12:10 ` Pierre Weis
1999-10-08 18:05 ` skaller
1999-10-09 23:17 ` Markus Mottl
1999-10-09 23:52 ` Pierre Weis
1999-10-10 8:14 ` skaller
1999-10-10 12:56 ` Michel Quercia
1999-10-10 21:16 ` Pierre Weis
1999-10-11 5:37 ` Lyn A Headley
1999-10-12 18:52 ` skaller [this message]
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