How to find common elements on two different length vectors in R?

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I need to find common elements in 2 different lenght vectors.

For example, I have a vector A with 10 elements, and a vector B with 3 elements.

I need get the position of which elements in A is equal to B.

A=[1,2,45,3,10,5,11,13,6,7]

B=[45,3,10]

C would be [3,4,5]

I have already tried "match" and "intercept" functions, but no success :(

Thanks a lot! :)



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