Why there is an error of undefined function 'coeffvalues' for input arguments of type 'fittype'

Hi All

I am trying to get the coefficients values for AM-AM curve fit to Rapp model function.

Using the toolbox of curvefit I generated a script.

However, I could not get the values using the command

k = coeffvalues(fun). where k is valus vector fun is function of Rapp model.

Error is : undefined function 'coeffvalues' for input arguments of type 'fittype'

Appreciate your help and assistance

Kind Regards

Av

Answer 1

[Andrew Shum]

Based on the error, it looks like you are passing a fittype object instead of a cfit or sfit object. Look at the example in the MatLab documentation.

https://www.mathworks.com/help/curvefit/coeffvalues.html#f3-588092