How to sum up unique arrays in the matrix

Hi everyone,

Suppose the matrix A is as follows:

    A = [10  1  180
    10  1  40
    10  1  40
    10  1  160
    10  2  10
    10  3  410
    10  1  10
    10  1  50
    12  1  30
    12  1  30
    12  2  45
    12  3  60
    65  1  15
    65  1  360
    ];

I want to sum up the values in column three if the value in column one and two are similar. The output matrix should be like:

B = [10  1  420
10  2  10
10  3  410
10  1  60
12  1  60
12  2  45
12  3  60
65  1  375
];

Answer 1

[Azzi Abdelmalek]

Edit

A = [10  1  180
  10  1  40
  10  1  40
  10  1  160
  10  2  10
  10  3  410
  10  1  10
  10  1  50
  12  1  30
  12  1  30
  12  2  45
  12  3  60
  65  1  15
  65  1  360
  ];
idx=any([0 0;diff(A(:,1:2))],2)
jdy=cumsum(idx)
b=accumarray(jdy+1,1:numel(jdy),[],@(x) sum(A(x,3)))
[ii,jj,kk]=unique(jdy)
out=[A(jj,1:2) b]