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

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MAWE
MAWE 2023-7-10
回答： Anuj 2023-7-10
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?

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回答（1 个）

Anuj
Anuj 2023-7-10
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.

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