problems with matrix splitting

Hello everyone, I want to split the matrix in such a way that when elements of 1st column are equal, the correspnding elements can be splitted into another matrix. For example, i have the following matrix.

A = [ 1 2; 1 3; 1 4; 2 1; 2 4].

i want to get the following 2 matrices as the resulting matrices.

a1 = [2;3;4] and a2= [1;4]

i have just started learning the looping in MATLAB, your coperation will be highly appreciated.

Answer 1

[Azzi Abdelmalek]

A = [ 1 2; 1 3; 1 4; 2 1; 2 4]
[ii,jj,kk]=unique(A(:,1),'stable')
out=accumarray(kk,A(:,2),[],@(x){x})
celldisp(out)

[pradeep kumar]

Thanks Azzi. That was a great help indeed. but , please note that in my actual problem A is a huge matrix of order (100 X 2). Is there anyway to use the accumarray inside a loop ? kindly help me.

[Azzi Abdelmalek]

Relatively, 100x2 is not Huge. And how do you want to use the loop?

[pradeep kumar]

I have no idea . So i am asking, is there any way ?

[Azzi Abdelmalek]

I mean your question is not clear, why do you need a for loop, when accumarray can do the job?

Answer 2

[Stephen23]

Use accumarray:

 out = accumarray(A(:,1),A(:,2),[],@(v){v})

[pradeep kumar]

Thanks Stephen. That was a great help indeed. but , please note that in my actual problem A is a huge matrix of order (100 X 2). Is there anyway to use the accumarray inside a loop ? kindly help me.