Problem Fitting Custom Equation (Beta Amplitude) using CFTOOL

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Ricky80
Ricky80 2018-3-19
评论： Ricky80 2018-3-19
Hy everyone!
I need to fit some experimental XY data on the function reported in the attached image
I'm tryng to use cftool with Custom Equation option but when I insert (a3-1) or (a4-1) as index exponentials the fit returns the error:
Complex value computed by model function, fitting cannot continue. Try using or tightening upper and lower bounds on coefficients.
I dont' understand if I need to best define some range for the coefficents a1, a2,,,, for example starting with positive values
Thank you!

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