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Add indicative labels to vector values

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LH
LH on 12 Oct 2022
Answered: Stephen23 on 12 Oct 2022
Hi,
If I have two vectors:
A1 = [ 1 ; 2 ; 3 ];
A2 = [ 4 ; 5 ; 6 ];
Concatenating these two vectors gives:
A = [A1 ; A2];
I want to add another column to this vetoc that represents indicative binary labels, mainly either 0 or 1, so that I know from which vector this element corresponds to, i.e., I need to produce something like the following
A_labeled = [1 1;
2 1;
3 1;
4 0;
5 0;
6 0];
Any help would be appreicted.

Answers (3)

David Hill
David Hill on 12 Oct 2022
A1 = [ 1 ; 2 ; 3 ];
A2 = [ 4 ; 5 ; 6 ];
A_labeled=[A1,ones(size(A1));A2,zeros(size(A2))]
A_labeled = 6×2
1 1 2 1 3 1 4 0 5 0 6 0

Chunru
Chunru on 12 Oct 2022
A1 = [ 1 ; 2 ; 3 ];
A2 = [ 4 ; 5 ; 6 ];
A_labeled = [A1 ones(size(A1)); A2 zeros(size(A2))]
A_labeled = 6×2
1 1 2 1 3 1 4 0 5 0 6 0

Stephen23
Stephen23 on 12 Oct 2022
A1 = [1;2;3];
A2 = [4;5;6];
A1(:,2) = 0;
A2(:,2) = 1;
A = [A1;A2]
A = 6×2
1 0 2 0 3 0 4 1 5 1 6 1

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