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How to identify the repeated elements in an array and delete those rows?

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Carlos Puente
Carlos Puente 2023-4-9
回答： Star Strider 2023-4-9
I have a matrix array like this:
1 100
2 200
3 200
4 200
5 500
And I want to identify the repeated elements on the right column, and delete the entire row of the matrix, to get something like this:
1 100
2 200
5 500
How can I do that?

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回答（2 个）

the cyclist
the cyclist 2023-4-9
编辑：the cyclist 2023-4-9
Ran in:
Here is one way:
M = [1 100;
2 200;
3 200;
4 200;
5 500];
[~,j] = unique(M(:,2));
out = M(j,:)
out = 3×2
1 100 2 200 5 500
Star Strider
Star Strider 2023-4-9
Ran in:
Use unique —
A = [1 100
2 200
3 200
4 200
5 500];
[Au,ix] = unique(A(:,2),'stable');
Anew = A(ix,:)
Anew = 3×2
1 100 2 200 5 500
.

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