"b does not given the correct location"
It gives exactly the location described in the sort documentation, which states "I is the same size as A and describes the arrangement of the elements of A into B along the sorted dimension. For example, if A is a vector, then B = A(I)." Lets try it and see if that is what MATLAB returns:
V = [35,10,16,10,34];
[a,b] = sort(V,'ascend')
c = V(b)
So far you have not given any explanation of what you think the problem is. I will make a wild guess that you want the inverse indices for applying on the LHS, which can be obtained like so:
[~,d] = sort(b)
e = nan(size(d));
e(d) = V
