My Math Forum curve Fitting

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 November 11th, 2008, 10:05 AM #1 Newbie   Joined: Nov 2008 Posts: 6 Thanks: 0 curve Fitting Hi everyone, I have a question regarding curve fitting to data. My question is: If I have some data points one of them is (0,0) and when I fit them to a curve, how can I control this fitting curve and force it to pass a definite point like (0,0). I am attaching Matlab file for this work. Could anyone give help in this question? Thank you in advance. RainyCloud
 December 1st, 2008, 02:59 AM #2 Newbie   Joined: Oct 2008 Posts: 14 Thanks: 0 Re: curve Fitting If you use interpolation it will pass through your point automatically, if you use curve fitting you may model the error curve to enlarge the weight in the precise region you need this feet for example: $w(, y)= \omega e^{-\alpha (x^2 + y^2)}$ will give a weight of approximately 1.0 everywhere, except near (0,0) where it will be $\omega$. The constant $\alpha > 1$ controls how precise the error distribution will be around your point. There are other ways specific to function you are working with. Any special ways related to the Matlab syntax is beyond my knowledge.
 December 1st, 2008, 09:15 PM #3 Global Moderator     Joined: Nov 2006 From: UTC -5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms Re: curve Fitting It all depends on what type of curve you're fitting to the data, and what you want the result to be like.
 December 2nd, 2008, 05:42 PM #4 Senior Member   Joined: Jul 2008 Posts: 895 Thanks: 0 Re: curve Fitting This question was posed and answered in another forum a while back. There is a freeware program called, simply, "Graph", found at http://www.padowan.dk that will do just that ...draw a regression curve for a set of data points, or one that can be forced through the origin.

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