How can find column wise similarity of two matrix?

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SM
SM 2021-8-5
编辑： Chunru 2021-8-6
I have two matrice such as
A=[3 1 1 2 1 3 3 2
1 1 2 1 3 2 3 2 ];
B=[ 2 1 3 3 1 2 3 1
1 1 1 2 2 2 3 3 ];
If we look at these two matrices column wise, it is same at index 2 and 7. How can i find the index array [2 7] ?
Thanks!

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回答（2 个）

Chunru
Chunru 2021-8-5
Ran in:
A=[3 1 1 2 1 3 3 2
1 1 2 1 3 2 3 2 ];
B=[ 2 1 3 3 1 2 3 1
1 1 1 2 2 2 3 3 ];
find(all(A-B==0))
ans = 1×2
2 7
  2 个评论
Chunru
Chunru 2021-8-6
编辑：Chunru 2021-8-6
Ran in:
A = [1 2];
B = [1 2];
find(all(A==B, 1)) % explicitly 1st dimension (column wise)
ans = 1×2
1 2
A=[3 1 1 2 1 3 3 2
1 1 2 1 3 2 3 2 ];
B=[ 2 1 3 3 1 2 3 1
1 1 1 2 2 2 3 3 ];
find(all(A==B, 1)) % work for this too
ans = 1×2
2 7

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Awais Saeed
Awais Saeed 2021-8-5
Just use
idx = find(all(A == B))
idx =
2 7

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