Deleting rows of a matrix based on values from another matrix

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Hari
Hari 2022-7-8
回答： Johan 2022-7-8
I have a m x 3 matrix A, and a nx1 matrix B. I need to remove those rows of A if either column 1 or 2 of the matrix equals any value in B.

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Johan
Johan 2022-7-8
Ran in:
You can use ismember() to do that:
A = randi(5,5,3)
A = 5×3
5 5 4 2 5 3 2 1 3 4 4 4 3 5 3
B = randi(5,2,1)
B = 2×1
5 1
% Find all the row where col 1 to 2 of A have a value in B
mask = any(ismember(A(:,1:2),B),2)
mask = 5×1 logical array
1 1 1 0 1
A(mask,:) = [] % delete the rows of A according to the mask
A = 1×3
4 4 4

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Kritarth Sinha
Kritarth Sinha 2022-7-8
编辑：Kritarth Sinha 2022-7-8
Hello Hari,
You can simply use nested loops and for each value in column 1 or 2,you can check that is present in matrix B and do it accordingly.
Hope this will help.

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