How can I implement this for loop in vector operation form?

I have this for loop that I would like to implement more efficiently

clear all;
clearvars;
    
N = 5;
    
Rs = 100*10^6;
Ts = 1/Rs;
J = 4;
Tsamp = Ts/J;
    
x = 2.*randi([0 1], N, 1)-1;
s = repelem(x,J);
    
n=0:N*J-1;
t = Tsamp.*n;
    
x_t=0;
%% This is the for loop
for nn=1:length(n)
    x_t = x_t+ s(nn).*sinc(n-nn); 
end
    
plot(t, x_t)

How can I do this?

Answer 1

[Anuj]

Hi Mawe,

You can use parallel computing toolbox to use parfor to run the for loop parallelly, which would extensively reduce the computation time.

refer to this article - Parallel for-Loops (parfor) - MATLAB & Simulink - MathWorks India

or you can vertorize the inner for loop step with the following code -

x_t = sum(s .* sinc(n - (1:length(n))));

By vectorizing the code, we avoid the need for an explicit for loop, which can improve the execution speed and efficiency of the code.

NOTE - The vectorized version assumes that the dimensions of s and n are compatible for element-wise operations.