How to define Estimated Correlation Formula on MATLAB?

I really can't define this Equation On MATLAB

I've defined u(t) and y(t) with for loop

& I tried to define it with 2 inner fors

Answer 1

[Jon]

You are convolving y with itself and u with itself. You should be able to do this using the MATLAB conv function.

You should also be able to do it with a double for loop (one for loop inside of another). What problem did you have trying to do that?

[Jon]

Sorry, I should have said you are in the first instance convolving y with u, not with itself. In any case it is still a convolution and you can use conv for that