grabbing specific rows from matrix

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I have the following 25 x 3 matrix (let's call first column X, second Y, third INDEX)
xy_index =
1 1 1
2 1 2
3 1 3
4 1 4
5 1 5
1 2 6
2 2 7
3 2 8
4 2 9
5 2 10
1 3 11
2 3 12
3 3 13
4 3 14
5 3 15
1 4 16
2 4 17
3 4 18
4 4 19
5 4 20
1 5 21
2 5 22
3 5 23
4 5 24
5 5 25
I want to extract rows (and so X,Y and INDEX) corresponding to INDEX [1 5 13 21 25] (as an array). Result shoud be
extracted_xy_index =
1 1 1
5 1 5
3 3 13
1 5 21
5 5 25
Thanks!

Accepted Answer

Fangjun Jiang
Fangjun Jiang on 9 Sep 2022
Edited: Fangjun Jiang on 9 Sep 2022
RowSelection=[1 5 13 21 25];
xy_index(RowSelection ,:)

More Answers (1)

David Hill
David Hill on 9 Sep 2022
Edited: David Hill on 9 Sep 2022
idx=ismember(xy_index(:,3),index);
extracted_xy_index=xy_index(idx,:);

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