Path: news.mathworks.com!not-for-mail
From: "Richard Willey" <rwilley@mathworks.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: Trend Line / Curve
Date: Fri, 6 Nov 2009 10:53:24 -0500
Organization: The MathWorks, Inc.
Lines: 41
Message-ID: <hd1gpl$s3$1@fred.mathworks.com>
References: <hcv04u$9sq$1@fred.mathworks.com>
Reply-To: "Richard Willey" <rwilley@mathworks.com>
NNTP-Posting-Host: willeyr.dhcp.mathworks.com
X-Trace: fred.mathworks.com 1257522805 899 172.31.45.68 (6 Nov 2009 15:53:25 GMT)
X-Complaints-To: news@mathworks.com
NNTP-Posting-Date: Fri, 6 Nov 2009 15:53:25 +0000 (UTC)
X-Priority: 3
X-MSMail-Priority: Normal
X-Newsreader: Microsoft Outlook Express 6.00.2900.5843
X-RFC2646: Format=Flowed; Original
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579
Xref: news.mathworks.com comp.soft-sys.matlab:583044


Hi There

MathWorks offers a couple different products to extend the basic fitting 
capabilities in core MATLAB.

Curve Fitting Toolbox is specific designed to solve curve and surface 
fitting problems.  The toolbox supports a wide number of different 
parametric models including both exponential curves.  You also have the 
option to specify your own custom equation for nonlinear regression.  The 
Toolbox includes GUI and command line options for all fitting operations. 
The Toolbox also supports a variety of post processing options (calculating 
the area under a curve, differentiation, etc).  And, of course, the toolbox 
also supports standard goodness-of-fit measures including R^2.

If you're working with problems that feature a large number of independent 
variables you'd be better off looking at Statistics Toolbox.  Statistics 
Toolbox provides a number of metrics to determine whether your independent 
varaibles are correlated with one another.  The Toolbox also supports 
techniques like feature selection and feature transformation to help deal 
with these types of problems.

regards,

Richard



"Samoline1 Linke" <maganatewoman@yahoo.com> wrote in message 
news:hcv04u$9sq$1@fred.mathworks.com...
> Is it possible to find the trend curve ?
>
> E.g. when we do   plot (x,y)
>
> then in basic fitting we can do the fitting (trend line) for Linear and 
> Polynomial (curbic.. etc) but I could not find any GUI where I could fit 
> an exponential or logarithmic curve.
>
> In MS Excel, I see such an option and in Excel it gives the value of 
> R-square as well.