MATLAB code error verification

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Chethana Unni P
Chethana Unni P 2021-5-25
回答： Steven Lord 2021-5-25
Hi
What does the error shown below implies??
Index in position 2 exceeds array bounds (must not exceed 1)

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回答（2 个）

Jan
Jan 2021-5-25
This means, that in the failing line of code an index is applied to the 2nd dimension of a variable, which has the size 1 only in this dimension:
x = (1:3).' % a column vector
x(1, 2) % No, the length of the 2nd dimension is 1 only
Steven Lord
Steven Lord 2021-5-25
Ran in:
You're asking for an element of an array in a column that doesn't exist in that array. Consider a 4-by-4 matrix:
A = magic(4)
A = 4×4
16 2 3 13 5 11 10 8 9 7 6 12 4 14 15 1
What's the element in the third row and fifth column of A? Since A doesn't have a 5th column, this question doesn't make sense and so MATLAB throws an error.
y = A(3, 5)
Index in position 2 exceeds array bounds (must not exceed 4).
In particular, because the error says that the index in position 2 must not exceed 1 we know that the array into which you're trying to index only has 1 column but you're asking for an element in columns 2, 3, or 4, or an even later column number.

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