Relabel the arrays' elements with an increasing order

Hi, I have this array:

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

and I need to relabel those elements with an increasing order, as follows:

B = [1 1 1 1 2 2 3 3 3 3 4 4 4]

Do you know any more compact solution than mine (here below)?

B = zeros(1,length(A));
[~,startunique] = unique(A);
c = sort(startunique);
for i = 1 : length(c)
    B(find(A==A(c(i)))) = i;
end

Answer 1

[Ameer Hamza]

Try this

A = [3 3 3 3 1 1 4 4 4 4 2 2 2];
[~, ~, B] = unique(A, 'stable');

Result

>> B
B =
     1
     1
     1
     1
     2
     2
     3
     3
     3
     3
     4
     4
     4

[Sim]

thanks a lot!

[Ameer Hamza]

I am glad to be of help!