The first two columns of matrix are considered indexes. This is only an example, my dataset is very large and don't know which indexes are duplicated,I want to sum the third column with repeated indexes to form the final matrix.
How to group by in matlab?
10 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
There is a matrix: [1 3 1;1 3 2;1 3 3;1 3 4;3 1 2;3 1 3]
i want to group by first two columns, and sum the third column.
idealy result is [1 3 10;3 1 5]
Antworten (1)
Cris LaPierre
am 8 Mai 2021
Bearbeitet: Cris LaPierre
am 8 Mai 2021
Perhaps with groupsummary?
A=[1 3 1;1 3 2;1 3 3;1 3 4;3 1 2;3 1 3];
[B,BG]=groupsummary(A(:,3),{A(:,1),A(:,2)},'sum');
C = [cell2mat(BG),B]
0 Kommentare
Siehe auch
Kategorien
Mehr zu Matrix Indexing finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!