MATLAB: How to realize this vector operation

MATLABvector

I have a vector X and 5 states (each state is a vector like A B C D E as below).
 A = [10 11 12];
 B = [20 25];
 C = [37 37];
 D = [49];
 E = [57 51 54];
X = [ 10 11 12 20 25 37 37 49 57 51 54 ….];
[10 11 12] corresponds to A and will be represented as 1 in the resultant vector Z, like that 2 for B 3 for C etc.
How can I obtain Z from X. Here Z will be as below : Z = [1 2 3 4 5 …..];

Best Answer

A = [10 11 12];
B = [20 25];
C = [37 37];
D = [49];
E = [57 51 54];
X = [ A C B E D E E A D];
v={A,B,C,D,E};
y=zeros(1,numel(X));
for k=1:numel(v)
  id=find(diff([0 ismember(X,v{k})])==1);
  y(id)=k;
end
out=y(y~=0)
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