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: will give a weight of approximately 1.0 everywhere, except near (0,0) where it will be . The constant 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.


Tags 
curve, fitting 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
curve fitting  bottlerocket  Applied Math  1  December 21st, 2012 05:45 AM 
Statistics : Curve fitting  colorless  Probability and Statistics  6  October 4th, 2011 12:36 PM 
Curve fitting problem  Stormer  Algebra  2  September 11th, 2011 03:33 AM 
Curve fitting and endpoints  billymac00  Applied Math  0  October 13th, 2009 07:43 AM 
Curve fitting.  sgrya1  Algebra  1  January 12th, 2008 10:12 AM 