the problem is extension of the question https://www.mathworks.com/matlabcentral/answers/106095-comparing-matrix-elements-and-performing-operation-if-equal

whenever the elemnts in column 1 and 3 both are repeated elsewhere in matrix then only third column should get added up

e.g

A=

18 18 1

17 20 2

18 18 1

17 25 2

19 17 3

18 18 1

19 17 3

then answer should be

18 18 1

17 20 2

18 18 2

17 25 2

19 17 3

18 18 3

19 17 6

## Best Answer