adding the rows for unique numbers

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I want to add the first column for each unique value in column 3. In this example i want the count 4 for 1 and count equal to 1 for the value 2 in column 3.
A=[0,1,0,1,1,0,0,0,0,1,1,0,0,0] % First column
B=[1,1,1,1,1,1,1,1,1,1,2,2,2,2] %second Column
ans= [4,1] % desired output

Accepted Answer

Walter Roberson
Walter Roberson on 5 Jan 2022
A = [0,1,0,1,1,0,0,0,0,1,1,0,0,0]; % First column
B = [1,1,1,1,1,1,1,1,1,1,2,2,2,2]; %second Column
[G, value] = findgroups(B(:));
total = accumarray(G, A(:));
table(value, total)
ans = 2×2 table
value total _____ _____ 1 4 2 1

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