How can I efficiently vectorize a for-loop in MATLAB? Provide an example where vectorization significantly improves performance compared to a traditional loop.

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Tyo
Tyo 2023-7-31
编辑： Walter Roberson 2023-8-22
How can I efficiently vectorize a for-loop in MATLAB? Provide an example where vectorization significantly improves performance compared to a traditional loop.

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recent works
recent works 2023-7-31
编辑：Walter Roberson 2023-8-22
Example to calculate the cumulative sum of an array using a for-loop and its vectorized version:
% Sample array
arr = 1:100000;
% Using for-loop
tic;
sum_loop = 0;
for i = 1:length(arr)
sum_loop = sum_loop + arr(i);
end
time_loop = toc;
% Using vectorization
tic;
sum_vectorized = sum(arr);
time_vectorized = toc;
disp("Using for-loop: Sum = " + sum_loop + ", Time taken = " + time_loop + " seconds.");
disp("Using vectorization: Sum = " + sum_vectorized + ", Time taken = " + time_vectorized + " seconds.");
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Les Beckham
Les Beckham 2023-7-31
Ran in:
In case someone want to actually see the results:
% Sample array
arr = 1:100000;
% Using for-loop
tic;
sum_loop = 0;
for i = 1:length(arr)
sum_loop = sum_loop + arr(i);
end
time_loop = toc;
% Using vectorization
tic;
sum_vectorized = sum(arr);
time_vectorized = toc;
disp("Using for-loop: Sum = " + sum_loop + ", Time taken = " + time_loop + " seconds.");
Using for-loop: Sum = 5000050000, Time taken = 0.019152 seconds.
disp("Using vectorization: Sum = " + sum_vectorized + ", Time taken = " + time_vectorized + " seconds.");
Using vectorization: Sum = 5000050000, Time taken = 0.001957 seconds.

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