MATLAB: Sorting and collecting data from arrays

Question

I have two columns which contain data and I am struggling to figure out how you could design code to run through the matrix and select the groups of numbers with their corrsposning 2nd column number.

For example a matrix has to 2 columns and 10 rows and each number out of the first coulmn has its corrosponding number out of the second column.

What I want to do is to take all the 1's and their corrspronding value in the 2nd column and put them into a seperate matrix, and then take all the 2's with there corrsponding values and put them into a matrix and so…

A(:,1)=[1; 1; 1; 1; 2; 2; 2; 2; 3; 3]

A(:,2)=[9; 4; 6; 3; 6; 7; 6; 4; 9; 4]

Any help would be great cheers!

Answer 1

 range = unique(A(:,1));
 for i = 1:numel(range)
  collection{i} = A(range(i) == A(:,1),2);
 end