Merge matrices by matching first column values in MATLAB?

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Natalie Williams
Natalie Williams 2016-7-6
评论： Robert 2016-7-6
I have two matrices A and B, where they share some common values in the first column. I would like to merge these into one matrix giving only the values they have in common in the first column along with their respective values in the other columns. For example
A= 4 5.3
5 7.3
8 2.5
9 4.7
B= 1 3.6 0.4
2 3.9 0.6
3 9.2 0.9
4 5.1 0.1
5 0.7 0.5
6 8.3 0.7
7 7.3 0.2
8 1.6 0.6
9 4.6 0.2
The output would be
C= 4 5.3 5.1 0.1
5 7.3 0.7 0.5
8 2.5 1.6 0.6
9 4.7 4.6 0.2
My actual data sets are much longer but this is the general idea.
Thanks

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采纳的回答

Robert
Robert 2016-7-6
A= [4 5.3
5 7.3
8 2.5
9 4.7];
B= [1 3.6 0.4
2 3.9 0.6
3 9.2 0.9
4 5.1 0.1
5 0.7 0.5
6 8.3 0.7
7 7.3 0.2
8 1.6 0.6
9 4.6 0.2];
[~,ia,ib] = intersect(A(:,1),B(:,1));
C = [A(ia,1:2),B(ib,2:3)]
  1 个评论
Robert
Robert 2016-7-6
The difference between this answer and Azzi's is that this works even if not all values of the first column in A appear in the first column of B. Delete the last row of B to see the difference.

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更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2016-7-6
A= [4 5.3
5 7.3
8 2.5
9 4.7]
B= [1 3.6 0.4
2 3.9 0.6
3 9.2 0.9
4 5.1 0.1
5 0.7 0.5
6 8.3 0.7
7 7.3 0.2
8 1.6 0.6
9 4.6 0.2]
B1=B(ismember(B(:,1),A(:,1)),:)
C=[A B1(:,2:3)]

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