Error says "Subscript indices must either be real positive integers or logicals"
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x = [1, 2, 3, 4, 5, 6, 7, 8, 9, 9, 9, 8, 7, 6, 5, 4, 3, 2, 1];
n = -9:9;
x1 = 5*x(n-2) - 3*x(n+4)
How to remove this error?
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Sam Chak
on 1 Nov 2023
Edited: Sam Chak
on 1 Nov 2023
What is variable n? It seems that n indicates the relative position (left and right) from the mean of the data set x, which is an array. In array indexing in MATLAB, the sequential position are assigned as positive integers that begins from 1 (Python indexing starts at 0). This is the Rule in MATLAB.
Answers (1)
Arun
on 1 Nov 2023
Hey,
here, the variable 'x' has index values ranging from 1 to 19. So to remove the error keep the index value with in that range of 1 to 19. For n-2 and n+4 both to be in range 1 to 19 the supported value for are in range 3 to 15. You can use the following code:
x = [1,2,3,4,5,6,7,8,9,9,9,8,7,6,5,4,3,2,1];
n = 3:15;
x1 = 5 * x(n-2) - 3*x(n+4)
another workaround can be to restructure the equation with respect to the size of 'x', one possible way is:
x = [1,2,3,4,5,6,7,8,9,9,9,8,7,6,5,4,3,2,1];
n = -9:9;
n = n + 10;
x1 = 5 * x(n)-2 - 3*x(n)+4
Hope this gives you an idea to proceed.
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