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IoanaC

Germany
Posts
Posted - 01/21/2005 :  09:18:56 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7,5GSR2
Operating System: Windows

Hello,

Is it possible to fit data using a user defined function in the form of:
f(x,y)= a+bx+cy+d*x^2+e*y^2+...

I couldn´t find any way of doing this with the advanced fitting tool nor the fitting wizard!

Thank you very much!
Ioana

easwar

USA
1965 Posts
Posted - 01/21/2005 :  10:47:58 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Ioana,

It is possible to fit such an equation with the NLSF tool in Origin - this is an issue of fitting with multiple independent variables. The only shortcoming is that a surface plot of the data and the fit surface is not automatically created, but the fit parameters will be correct.

Please see the following article that discusses how to do this:
http://www.originlab.com/index.aspx?s=9&pid=434

Easwar
OriginLab
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