making sub arrays of first column depending on the second column number

Hi,

I have a matrix with 2 columns let's assume [ 15 2;14 2;10 3;13 3;9 3] how can I get sub arrays from the first column that corresponds to the same number of second column. in this example [15 14] and [10 13 9]? Appreciate your help. Thanks.

Answer 1

[madhan ravi]

Wanted = splitapply(@(x){x},a(:,1),findgroups(a(:,2))) % where a is your matrix
celldisp(Wanted)

[madhan ravi]

% For older versions:

w = accumarray(a(:,2),a(:,1),[],@(x){x});
Wanted = w(~cellfun('isempty',w)); 
celldisp(Wanted)

[Sho Gan]

worked. Thank you very much.

Answer 2

[Walter Roberson]

G = findgroups(YourMatrix(:,2));
subarrays = splitapply(@(varargin) {varargin{:}}, YourMatrix(:,1), G);

[Sho Gan]

Thanks so much. this worked perfectly :)