Find the value of a and k that minimise RMSE

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Tsang Chak Ng 2017-12-19

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https://ww2.mathworks.cn/matlabcentral/answers/373637-find-the-value-of-a-and-k-that-minimise-rmse

回答： Ben Drebing 2017-12-21

Hello,I am trying to find the value of a and k that minimise my function RMSE,I have input the following code,can I just asked where have I got wrong since Matlab asked me to have more arguments for some reason?

    %lightprog
    function RMSE=lightprog(V)
    k=V(1);a=V(2)
    stimulus=[2 4 6 8 10 12]
    data=[1.1 1.5 2.1 2.5 2.9 3.2]
    modelS=k*(stimulus.^a);
    RMSE=sqrt(mean(modelS-data).^2)
    return
    [k,a]=fminsearch('lightprog',[0,0])

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Answer 1

Ben Drebing 2017-12-21

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https://ww2.mathworks.cn/matlabcentral/answers/373637-find-the-value-of-a-and-k-that-minimise-rmse#answer_297328

在 MATLAB Online 中打开

The function needs to be defined at the bottom of the file, if you would like to run your code in this way. Try:

 [k,a]=fminsearch(@lightprog,[0,0])
 function RMSE=lightprog(V)
    k=V(1);a=V(2)
    stimulus=[2 4 6 8 10 12]
    data=[1.1 1.5 2.1 2.5 2.9 3.2]
    modelS=k*(stimulus.^a);
    RMSE=sqrt(mean(modelS-data).^2)
    return
 end