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 Fittinf non linear function to set of numbers		  New Topic  Reply to Topic
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gontar700

Bangladesh
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Posted - 04/06/2004 :  09:08:08 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
I have a set of non dependant (x axis) numbers and their match numbers (y axis). i suspect it's a probolic function, so how do i macth this function with the excel ?

Thanks in advance
Daniel

Mike Buess

USA
3037 Posts
Posted - 04/06/2004 :  10:15:16 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Daniel,

I don't know how to do it in Excel, but it's easy in Origin.

1. Plot the y values versus x values. (Select Y column and Plot->choose a type).
2. Tools->Polynomial Fit
3. Set Order to 2, other settings as appropriate.
4. Click the Fit button. Fit curve is drawn, parameters appear in the Results log.

More advanced fitting is possible with Analysis->Non-Linear Curve Fit->Advanced Fitting Tool.

Mike Buess
Origin WebRing Member
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