# MATLAB: Concatenating more values on a matrix

concatenatingmatrixsort

Hi everyone! I've been struggling with a simple problem for a while but i could not figure it out how to do it. What i want to do is that if it happens to be the same value more then once on the first column is to eliminate the others and add their second column together. For the example in the picture i want:
6 – 0.03;
8 – 0.05;
5 – 0.06;
3 – 0.03;
if true  % v = fix(10*rand(10))heads = 1:10;probab = 1:10;count = 0;for i = 1:10  heads(i) = v(i);  for j = 1:10      if ( v(i,j) == heads(i) )         count = count + 1;      end  end  probab(i) = count;  count = 0;    endX = vertcat(heads, probab/100)end

>> A = [6,3,8,5,3,9,8,5,6,5;0.01,0.02,0.03,0.01,0.01,0.03,0.02,0.02,0.02,0.03];>> [B,~,idx] = unique(A(1,:));>> [B.',accumarray(idx(:),A(2,:))]ans =          3         0.03          5         0.06          6         0.03          8         0.05          9         0.03
>> [B,~,idx] = unique(A(1,:),'stable');>> [B.',accumarray(idx(:),A(2,:))]ans =          6         0.03          3         0.03          8         0.05          5         0.06          9         0.03