Same values in matrix column

Hello. I have the next problem.

I have the matrix and i want to create a new one who will give to the common values ​​of the first column all the values ​​of the second. For example . Can anyone help me about a command on this. Thanks in advance

Answer 1

[Voss]

Here is a way:

m = [1 2; 1 5; 1 8; 2 4; 2 5];

[mm,~,jj] = unique(m(:,1));
n = numel(mm);
result = [mm zeros(n,nnz(jj == mode(jj)))];
for ii = 1:n
    idx = jj == ii;
    result(ii,2:nnz(idx)+1) = m(idx,2);
end
disp(result);

     1     2     5     8
     2     4     5     0

[nick]

thanks you Voss

[Voss]

You're welcome!