Sum values corresponding to a number in a vector

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Sourangsu Chowdhury
编辑： Stephen23 2018-9-24
4 1
4 10
4 2
8 20
5 12
5 4
5 8
5 6
Suppose I have two vectors, I need average of the digits in second vector corresponding to the digits in the first vector such that the result is
4 13
8 20
5 30

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Stephen23
Stephen23 2018-9-24
编辑：Stephen23 2018-9-24
>> M = [4,1;4,10;4,2;8,20;5,12;5,4;5,8;5,6]
M =
4 1
4 10
4 2
8 20
5 12
5 4
5 8
5 6
>> [U,~,X] = unique(M(:,1));
>> S = accumarray(X,M(:,2),[],@sum);
>> [U,S]
ans =
4 13
5 30
8 20

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