Path: news.mathworks.com!newsfeed-00.mathworks.com!newscon06.news.prodigy.net!prodigy.net!border1.nntp.dca.giganews.com!nntp.giganews.com!postnews.google.com!h54g2000cwb.googlegroups.com!not-for-mail
From: "sturlamolden" <sturlamolden@yahoo.no>
Newsgroups: comp.soft-sys.matlab,comp.lang.python
Subject: Re: About alternatives to Matlab
Date: 18 Nov 2006 10:57:00 -0800
Organization: http://groups.google.com
Lines: 23
Message-ID: <1163876220.121691.166740@h54g2000cwb.googlegroups.com>
References: <1161613941.550194.204870@e3g2000cwe.googlegroups.com>
NNTP-Posting-Host: 89.8.51.54
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
X-Trace: posting.google.com 1163876225 26793 127.0.0.1 (18 Nov 2006 18:57:05 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Sat, 18 Nov 2006 18:57:05 +0000 (UTC)
In-Reply-To: <1163791069.178490.198740@j44g2000cwa.googlegroups.com>
User-Agent: G2/1.0
X-HTTP-UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1) Gecko/20061010 Firefox/2.0,gzip(gfe),gzip(gfe)
Complaints-To: groups-abuse@google.com
Injection-Info: h54g2000cwb.googlegroups.com; posting-host=89.8.51.54;
Xref: news.mathworks.com comp.soft-sys.matlab:379388 comp.lang.python:437491



Filip Wasilewski wrote:

> Actually you have not. The algorithm you presented gives completely
> wrong results. Have a look at quick&dirty(TM) implementation bellow.

God grief. I followed the implementation in Ingrid Daubechies' and Wim
Sweldens' original wavelet lifting paper  (J. Fourier Anal. Appl., 4:
247-269, 1998). If you look at the factorized polyphase matrix for D4
(which gives the inverse transform), their implementation of the
lifting steps the original paper is incorrect. That is scary.

A free PDF or PS of the paper is available here:

http://cm.bell-labs.com/who/wim/papers/factor/index.html



Thanks a lot!


Sturla Molden