Is there a way to check each index of a matrix against each index of another smaller matrix?

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Caroline F
Caroline F 2022-4-20
回答： Voss 2022-4-20
Is there a way to check each index of a matrix against each index of another smaller matrix? I am trying to create a code that will check the index of one matrix, A, and compare it to another matrix, B. I want to find a row vector in A where none of the index in that row are equal to any of the index in B. I was thinking of using a for loop and somehow incorporating the find() function, but I am not sure where to start. Any tips would be appreciated.

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Voss
Voss 2022-4-20
Ran in:
% a matrix:
A = magic(5)
A = 5×5
17 24 1 8 15 23 5 7 14 16 4 6 13 20 22 10 12 19 21 3 11 18 25 2 9
% a smaller matrix:
B = [1 15 6; 20 12 21; 25 2 9]
B = 3×3
1 15 6 20 12 21 25 2 9
% index(es) of row(s) of A that have no elements in B:
find(~any(ismember(A,B),2))
ans = 2
% breaking that expression down a little bit:
ismember(A,B)
ans = 5×5 logical array
0 0 1 0 1 0 0 0 0 0 0 1 0 1 0 0 1 0 1 0 0 0 1 1 1
any(ismember(A,B),2)
ans = 5×1 logical array
1 0 1 1 1
~any(ismember(A,B),2)
ans = 5×1 logical array
0 1 0 0 0

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