curve fitting toolbox error

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Jernej
Jernej on 2 Jun 2014
Edited: Matt J on 2 Jun 2014
I am trying to fit data to this equation b*(coth(x/a)-a/x) using the curve fitting toolbox. I get this error NaN computed by model function, fitting cannot continue. Try using or tightening upper and lower bounds on coefficients. Here is the screenshot: https://www.dropbox.com/s/2bgx89frrx2pjbo/b_h.jpg

Accepted Answer

Matt J
Matt J on 2 Jun 2014
Edited: Matt J on 2 Jun 2014
You must prevent the search from including a=0. Otherwise, you will have division by 0 operations x/a.

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