Find the value of a and k that minimise RMSE

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Tsang Chak Ng
Tsang Chak Ng 2017-12-19
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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回答（1 个）

Ben Drebing
Ben Drebing 2017-12-21
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

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