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Curve Fitting Using Outside Parameter

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Saeid
Saeid 2017-12-15
回答： Torsten 2017-12-15
I am trying to find a fit to a set of (X,Y) data where X varies between 0.001 & 1000 and the form of the fit functions is as shown in the FitFun below:
n=-0.3;
FitOpt=fitoptions('Method','NonlinearLeastSquares',...
'lower',[1*max(Y) 0 1],...
'upper',[50*max(Y) 3 2])
FitFun=fittype('(Y0*(1+(X0*X)^a))^((n-1)/a)',...
'dependent',{'Y'},'independent',{'X'},...
'coefficients',{'Y0','X0','a'});
When I run the script I get the message:
Conversion to cellstr from double is not possible.
It looks like the fit function cannot accept n as an outside parameter. How can I solve this problem?

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回答（1 个）

Torsten
Torsten 2017-12-15
Use ...'problem','n'... in the FitType structure and set "n" to a value in the call to "fit".
Best wishes
Torsten.

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