Keeping the rows in an array with specified numbers

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L'O.G.
L'O.G. 2022 年 4 月 2 日
回答済み: Voss 2022 年 4 月 2 日
I want to keep the part of the array with specified numbers in column 2. This deletes the rows in the array with the specified numbers in column 2, but how do I do the opposite (keep all rows where the numbers 5 or 6 are in column 2)?
numbersTokeep = [5,6];
A = magic(5);
for n = numbersToKeep
A((A(:,2) == n),:) = [];
end

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Voss
Voss 2022 年 4 月 2 日
numbersTokeep = [5,6];
A = magic(5);
disp(A);
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
% keep rows where column 2 is 5 or 6:
A = A(ismember(A(:,2),numbersTokeep),:);
disp(A);
23 5 7 14 16 4 6 13 20 22
A = magic(5);
% or, delete rows where column 2 is not 5 or 6:
A(~ismember(A(:,2),numbersTokeep),:) = [];
disp(A);
23 5 7 14 16 4 6 13 20 22

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