Option 'stable' of the command unique?

I have a matrix A ax1 and a vector B which is obtained as

B=sum( bsxfun(@eq, A, unique(A,'stable')') )'

E.g.

A=[5; 5; 3; 4; 4; 4];
B=[2;1;3];

The problem is that the option 'stable' is not recognized in my current version of Matlab. Do you have any idea about how I can replace this command?

Answer 1

[Azzi Abdelmalek]

[a,idx]=unique(A)
[ii,ii]=sort(idx);
B=sum( bsxfun(@eq,A,a(ii)'))'