Index error in code

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Abdullah Qayyum
Abdullah Qayyum 2020-4-18
回答： Dhruv 2025-6-2
I am trying to execute this code but it gives me an error Index exceeds array bounds.
I= [234, 112, 22, 56; 78, 81, 119, 121; 98 193 250 211; 33 135 199 201];
s=[110 45 32; 95 150 67; 89 76 55];
s2= s(I+1)
  2 个评论
KSSV
KSSV 2020-4-18
What you are doing is wrong. You are trying to access more number of elements from s. What exactly you want to do?
Abdullah Qayyum
Abdullah Qayyum 2020-4-19
I am applying sbox on an encrypted image.

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回答（1 个）

Dhruv
Dhruv 2025-6-2
Hi @Abdullah Qayyum
The error is being encountered because you're using values from matrix I to index into matrix s, which only has 9 elements (3x3 matrix). MATLAB uses 1-based indexing, so the valid index range for s is 1 to 9. However, elements in I+1 go well beyond this range (up to 251), causing the "Index exceeds the number of array elements" error.
To fix it, either make s a vector with at least max(I(:)) + 1 elements or ensure the values in I+1 do not exceed 9.
I hope this helps!

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