fitting the equation on a graph and finding unknown parametrs

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Abdul Samad
Abdul Samad 2011 年 3 月 7 日
I've some plot and a given equation with some unknown parameters in it. I've to find out the unknown parameters by fitting that equation in to the plot. Please guide me how can I do that?

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回答 (2 件)

Walter Roberson
Walter Roberson 2011 年 3 月 7 日
polyfit, linear regression, non-linear regression, log-linear regression... There are different ways depending upon the form of the equation. It would probably help if you posted the equation and indicated which symbols needed to be fit.
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Abdul Samad
Abdul Samad 2011 年 3 月 7 日
Equation is below
Eg=E-at.^2/(b+t)
and the parameters that need to be known are 'a' and 'b'.
Since I'm a new user of Matlab so a detailed answer will be appreciated:)

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Brett Shoelson
Brett Shoelson 2011 年 3 月 7 日
You've gotta love the Curve-Fitting Toolbox for this!
Cheers,
Brett
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Abdul Samad
Abdul Samad 2011 年 3 月 7 日
Thanks Brett for the link, it's quite useful for learning. For now it is hard for me to get the one I required :)

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