Find element index of one array which is equal to the values from another array

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Given two arrays
A = [1,1,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,4];
B = [1,1,1,1,1,1,3,3,3,3];
return C=[1,2,3,4,5,6,11,12,13,14]
The first "3" in B is the 11th value in A.
The values in C is the index of the values in B which exist in A.
Any suggestions?

Accepted Answer

ME
ME on 22 Nov 2019
A = [1,1,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,4];
B = [1,1,1,1,1,1,3,3,3,3];
u=unique(B);
C=[];
for i=1:numel(u)
C=[C find(A==u(i))];
end
A more elegant solution probably exists but this will work.

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