Path: news.mathworks.com!not-for-mail
From: "Mario " <nospam@yahoo.com>
Newsgroups: comp.soft-sys.matlab
Subject: data fitting / data analysis - spline?
Date: Tue, 2 Sep 2008 20:20:17 +0000 (UTC)
Organization: UBC
Lines: 19
Message-ID: <g9k761$d2h$1@fred.mathworks.com>
Reply-To: "Mario " <nospam@yahoo.com>
NNTP-Posting-Host: webapp-05-blr.mathworks.com
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 8bit
X-Trace: fred.mathworks.com 1220386817 13393 172.30.248.35 (2 Sep 2008 20:20:17 GMT)
X-Complaints-To: news@mathworks.com
NNTP-Posting-Date: Tue, 2 Sep 2008 20:20:17 +0000 (UTC)
X-Newsreader: MATLAB Central Newsreader 1244954
Xref: news.mathworks.com comp.soft-sys.matlab:488316



Hi!
I'm analyzing a list of x-y values,
http://www.geocities.com/mariopwr/data.png
http://www.geocities.com/mariopwr/dataxy.zip ,and i'm
wondering if anybody can suggest me a good way to fit a
curve on these points.
I tried using the spline toolbox and I found a good (in my
opinion) fit using the least square approximation with order
14 (http://www.geocities.com/mariopwr/spline.png). Do you
think it's a good approximation or should i try a different
method?

Anyway, after that i'd want to extract a few information
from this graph like amplitude and width of each wave. Any
suggestion?

Thank you for your help! 

Mario