How to cycle through elements in an array in Matlab

Hello there, I am trying to cycle through the elements in an array given a specified number of iterations. For other languages where the first element is 0, I can easily utilize the modulo command and so when the iteration is equal to the modulo it will evaluate to 0 and the array in question will start from the beginning again. However, with MATLAB, since the elements start with 1, I cannot utilize the same idea. How do I get around this? And very much possibly without the use of if else anywhere. Thank you!

Answer 1

[the cyclist]

You can utilize the same idea. Just offset by one inside outside mod():

A = [2 3 5 7];

% Illustrate the mod() cycle with offset
for iteration = 1:8
    idx = mod(iteration-1,length(A))+1
end

idx = 1

idx = 2

idx = 3

idx = 4

idx = 1

idx = 2

idx = 3

idx = 4

% Index into the array
for iteration = 1:8
    idx = mod(iteration-1,length(A))+1;
    A(idx)
end

ans = 2

ans = 3

ans = 5

ans = 7

ans = 2

ans = 3

ans = 5

ans = 7

[Alif Aiman Ahmad Zukiman]

ah excellent. Thank you!

Answer 2

[Voss]

To account for indexing in MATLAB starting with 1, subtract 1 from the iteration number, perform mod(), then add 1 to the result.

idx = mod(iteration-1,N)+1;

That will give idx values starting with 1 when iteration is 1, and as iteration increases, idx increases to N and then repeats starting with 1 again when iteration is N+1, and so on.

[Alif Aiman Ahmad Zukiman]

ah excellent, thank you!