Curve fitting tool error with custom equation

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Luca Fanciullini
Luca Fanciullini 2021-6-15
评论： Luca Fanciullini 2021-6-15
Hi,
I'm trying to fit this equation a*exp(-b*x) + c*(1/x)+d to my data. Using the curve fitting tool I constantly get this error:
Inf computed by model function, fitting cannot continue.
Try using or tightening upper and lower bounds on coefficients.
Yes, I tried to tighten the bounds on coefficients but it didn't really work.
You can find attached a .mat file with my data.
Here's a screenshot:
Thank you so much!!

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采纳的回答

Steven Lord
Steven Lord 2021-6-15
Does your data contain a point with x = 0? If so the term c*(1/x) is going to give you Inf or NaN (depending on whether or not c is 0 when you try to evaluate the fit) and the Curve Fitting Tool does not support that.
If you want to keep that form, remove data points with x = 0 from your data before trying to fit.

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