Date: Feb 21, 2013 6:16 AM
Author: Pascal Schulthess
Subject: Difference of cost functions in optimization?
Hi everyone,

I'm working quite a long time with lsqnonlin and comparable functions but now I'm wondering if there's a difference between the following two expressions of the cost function:

First:

f = [0,1];

function error = objFcn(p, x, y)

fit = zeros(size(ydata));

for i = 1:size(ydata, 1)

fit(i,:)= p(1)*x + f(i)*p(2);

end

error = fit-y;

end

And, secondly:

function error = objFcn(p, x, y)

fit = zeros(size(ydata));

fit(1,:)= p(1)*x;

fit(2,:)= p(1)*x + p(2);

error = fit-y;

end

I would really appreciate any help and possible explanations.

Thanks a lot,

Pascal