How do i fix this error?

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Yusuke
Yusuke 2019-3-17
回答： Stephan 2019-3-17
Here's my code, I'm trying to fit a arctangent function to data,
years = xlsread('C:\Users\a\Desktop\WorldPopulation', 'A1:CO1');
population = xlsread('C:\Users\a\Desktop\WorldPopulation', 'A2:CO2');
x = years.';
y = population.';
FO = fitoptions('Display','iter',...
'StartPoint',[4100 0.02 -39.7 6500],...
'MaxIter','2000',...
'MaxFuncEval','3000');
FT = fittype('a.*atan(c.*x+d)+b', 'options', FO);
[min, gof] = fit(x, y, FT);
But I keep getting the error
Error using curvefit.basefitoptions/set
The name 'Display' is not an accessible property for an instance of class 'basefitoptions'.
Error in fitoptions (line 189)
set(f,varargin{:});
Error in OptimizeCurve (line 15)
FO = fitoptions('Display','iter',...
How do i fix this?

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回答（1 个）

Stephan
Stephan 2019-3-17
Hi,
the Display option is only avaiable if the fitting method is nonlinear least squares:
https://de.mathworks.com/help/curvefit/fitoptions.html?s_tid=doc_ta#bto9o6s-1-Display.
The default Method is 'None' (which appears strange). I would expect, that it works, when you set:
FO = fitoptions('Method', 'NonlinearLeastSquares', 'Display','iter',...
'StartPoint',[4100 0.02 -39.7 6500], 'MaxIter','2000',...
'MaxFuncEval','3000');
Best regards
Stephan

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