Xor(A, B), does A, B have to be the same dimension?

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Feiyang Bai
Feiyang Bai 2022-6-12
评论： Feiyang Bai 2022-6-13
https://www.mathworks.com/help/matlab/ref/xor.html
C = xor(A,B) performs a logical exclusive-OR of arrays A and B and returns an array containing elements set to either logical 1 (true) or logical 0 (false). So, A and B has to be the same dimension so it could compare, right? But in the example, A is a 1*2; while B is a 2*1 dimension matrix.
Can anyone help me explain it?
Thanks,
  2 个评论
Stephen23
Stephen23 2022-6-12
编辑：Stephen23 2022-6-12
"So, A and B has to be the same dimension so it could compare, right?"
No.
"Can anyone help me explain it?"
The XOR documentation states that they have to be compatible sizes:
https://www.mathworks.com/help/matlab/matlab_prog/compatible-array-sizes-for-basic-operations.html
Feiyang Bai
Feiyang Bai 2022-6-13
Hi,
Thanks for the explaning and extra resource. I appreciate it.
Feiyang

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DGM
DGM 2022-6-12
编辑：DGM 2022-6-12
Ran in:
The arguments don't necessarily need to have the same size/shape, but they need to have compatible size/shape. Like many things in modern versions, implicit array expansion applies here. I imagine the example in the docs is something like:
xor([0 1],[0;1]) % xor two vectors
ans = 2×2 logical array
0 1 1 0
which is equivalent to
xor([0 1; 0 1],[0 0; 1 1]) % the two vectors expanded to a common array size
ans = 2×2 logical array
0 1 1 0
Consider the similarity:
plus([1 2 3 4],[1;2]) % add two vectors
ans = 2×4
2 3 4 5 3 4 5 6

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