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Find the value of a and k that minimise RMSE

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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])

Answers (1)

Ben Drebing
Ben Drebing on 21 Dec 2017
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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