Code the function in Matlab

I want to code this function in matlab ( ∑_{ i=1}^{n} f(x_{i})-y_{i} ), x_{i}=(x_{1},x_{2},...,x_{n}) and y_{i}=(y_{1},y_{2},...y_{n}). So, how can I write the code. Is there anyone who can help me? Thanks in advance.

Best regars, John

[James Tursa]

Do you know how to write a loop? Do you know how to use indexes with variables? Do you know how to call a function? What is f? What have you done so far?

[John Gebre]

Thank you for your interest to help me. It is clear the loop and calling a function. But, it is not clear for me how to use index with variables? So, focus on this point.

Answer 1

[Walter Roberson]

for K = 1 : 5
  Z(K) = X(K) - Y(K);
end

[John Gebre]

Thank for the index. But could you help me please how to code this function: ( ∑_{ i=1}^{n} f(x_{i})-y_{i} ). Look forward to hear from you soon.

[Image Analyst]

It's just trivial renaming of the variables, and putting the x-y difference into f().

for i = 1 : n
  fi(i) = f(x(i) - y(i));
end
theFinalSum = sum(fi);

Where f is your function. Or you could do this:

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