nonlinear fit model (coefficient and standard error)

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Redwood 2016-6-21

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https://ww2.mathworks.cn/matlabcentral/answers/291308-nonlinear-fit-model-coefficient-and-standard-error

回答： Star Strider 2016-6-21

Dear Matlab experts,

I would like to get coefficient and standard error for the nonlinear function. Please check this coding. Thank you very much in advance.

ds = dataset(Time,Energy,Capital,Emission); Time = [1,2,3,4,5]; Energy = [100,110,120,130,140]; Capital = [11,15,12,13,17]; Emission = [120,143,135,146,150]; modelfun = @(b,x)b(1)*exp(-b(2)*x(:,1))*x(:,2)-b(3)*(x:,3).^b(4)*x(:,2); pguess = [1,0.2, 0.01,0.02]; mdl = fitnlm(ds,modelfun,pguess)

Sincerely,

J1

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Answer 1

Star Strider 2016-6-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/291308-nonlinear-fit-model-coefficient-and-standard-error#answer_226198

You have several errors in ‘modelfun’, including an orphan comma and at least one unmatched parenthesis. I have no idea what function you are coding, so you have to fix this yourself.

When ‘modelfun’ is coded correctly, and if you’re still having problems, post back here and I’ll help you as much as I can.