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why do i get "Array indices must be positive integers or logical values " and how do i solve it ?

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theta = [0:23] * pi/12 + 3*pi/8;
x = ones(1, 24) + sin(theta);
X = fft(x) / 24;
X_period = X([-11:12]);
disp('X[k] for one period =');
disp(X_period);
Array indices must be positive integers or logical values.
  1 Comment
Dyuman Joshi
Dyuman Joshi on 3 Dec 2023
As the error message states - "Array indices must be positive integers or logical values."
X_period = X([-11:12]);
Here, you have provided negative values and 0 as indices, which is not allowed. That's why you get the error.
To resolve the error, don't provide values that are not allowed.

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Answers (1)

cr
cr on 3 Dec 2023
Edited: cr on 18 Mar 2024
your X_period should equal to
X(1:24)
If you want to view it shifted you can have
idx = -11:12;
and either use
plot(idx,X)
or if you rather just display the numbers in text,
[idx; X]'

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