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

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kaiqiang huang 2019-11-22

评论： ME 2019-11-22

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?

ME 2019-11-22

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.

kaiqiang huang 2019-11-22

Thank you so much! It works well !

ME 2019-11-22

No problem - happy to help!

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