[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Problem of polyfit

From: Tetsuro KURITA
Subject: Re: Problem of polyfit
Date: Fri, 7 Oct 2005 16:34:38 +0900

On 2005/10/07, at 13:05, Dmitri A. Sergatskov wrote:

You would get a very good fit if you normalize your data

It seems that my opinion was wrong.
I feel embarrassed about making much ado.

Why normailing data is requred.

But there was a person who meets same trouble to mine. msg01007.html msg01008.html

I hope polyfit will be improved for less hustle.

Also following two equations do not return same results, when calculating data I posted.

  p = inv(X'*X)*(X'*y);

  p = (X'*X)\(X'*y);

In the case of data I posted, first equation give better results. It looks that the operator "\" have a certain limitation. What is that ?

 Tetsuro KURITA
  E-mail: address@hidden

Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:
How to fund new projects:
Subscription information:

reply via email to

[Prev in Thread] Current Thread [Next in Thread]