MATLAB: Determining the total value of the number in each position of a matrix that corresponds to another same length matrix

matrix arraytotal number

Let's say i have a column vector medals = [1;1;5;7;3;1] and i have another column vector year = [2007;2009;2011;2018;2007;2007] and each of the element in 'year' corresponds to the matrix 'medals'. Eg: in 2007,i have 5 medals because year(1) ,year(5) and year(6) are 2007, and the total medals i won is 1+3+1 How do i find the total medals won for each of the year?

Best Answer

>> year = [2007;2009;2011;2018;2007;2007];
>> medals = [1;1;5;7;3;1];
>> [uni,~,idx] = unique(year);
>> cnt = accumarray(idx,medals);
>> [uni,cnt]
ans =
   2007      5
   2009      1
   2011      5
   2018      7
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