Code function using Matlab code

Currently, I am working a project with Matlab progrma. I have one problem with the summation variable. This is due lack of experience before. So, could you help me please to code this function in Matlab code: ( ∑_{ i=1}^{n} (f(x_{i})-y_{i} )^2). Look forward to hearing from you soon.

Answer 1

[Image Analyst]

Like I said in your duplicate question:

theSum = 0;
for i = 1 : n
  theSum = theSum + f(x(i) - y(i));
end

where f is your function.

[John Gebre]

Thank you very much for your answer. However, how can I define x(i) and y(i) from i = 1:n (i.e in Matlab code)?

[Image Analyst]

If you want x and y to both be vectors 1,2,3,4,5,....n then just do this:

x = 1:n;
y = 1:n;

Answer 2

[Walter Roberson]

Assuming that your function f is vectorizable, and assuming that x_ and y_ are of length n, then

sum((f(x_)-y_).^2)

if they are a different length then

sum((f(x_(1:n))-y_(1:n)).^2)

If your f is not vectorizable, but (for simplicity) assuming that x_ and y_ are the right length,

sum( (arrayfun(@f, x_) - y_).^2 )