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Average columns together that share a common value

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Lets say I have a 2 x 10 matrix M
The first column being an ID, and the second a value
1, 25
3, 33
3. 45
2, 22
4, 54
4, 56
5, 23
5, 65
1, 27
2, 29
How could I average the values with the same ID such that the new matrix would be
1, 26
2, 25.5
3, 39
4, 55
5, 44

Answers (1)

Paul
Paul on 21 May 2023
D = [1, 25
3, 33
3. 45
2, 22
4, 54
4, 56
5, 23
5, 65
1, 27
2, 29];
[G,ID] = findgroups(D(:,1));
[ID splitapply(@mean,D(:,2),G)]
ans = 5×2
1.0000 26.0000 2.0000 25.5000 3.0000 39.0000 4.0000 55.0000 5.0000 44.0000

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