Extracting data from 2 column array based on infromation in the 1st colum

Hello first time posting, I'm having a bit of trouble extracting information from a 2 column array here is a an example array. There is an attach example of some an array, what I've been trying to do is find a way to sort out all the data in the 2nd column the corresponds to 1, 2 etc, and create corrosponding vectors for each set of data. here is some of the code I've been messing with

>> for i = if B(1:end,1 == 0) A = B

end end

Answer 1

[Stephen23]

The best solution is to use accumarray:

>> A = [1,36;1,24;1,26;1,82;1,45;,2,68;2,27;2,91;3,91]
A =
     1    36
     1    24
     1    26
     1    82
     1    45
     2    68
     2    27
     2    91
     3    91
>> Z = accumarray(A(:,1),A(:,2),[],@(n){n})
Z = 
    [5x1 double]
    [3x1 double]
    [        91]

This puts the data into a cell array, using the values in the first column as indices. You can access the data in the cell array using cell array indexing:

>> Z{1}
ans =
    36
    24
    26
    82
    45
>> Z{2}
ans =
    68
    27
    91
>> Z{3}
ans =
    91

[Jonathan Duncan]

This works very well thanks for the help