How to extract a vector from a vector given a reference vector ?

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RuiQi
RuiQi 2016-12-23
回答： KSSV 2016-12-23
I have a main vector = [1 1 1 1 2 3 4 5 7 8 8 8 2 2 1 1 1 .....] and a reference vector = [1 3 4 7 9 1312] how do i extract the vector in main whose value are in reference vector ?
so it should be [1 1 1 1 3 4 7]

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KSSV
KSSV 2016-12-23
A = [1 1 1 1 2 3 4 5 7 8 8 8 2 2 1 1 1] ;
B = [1 3 4 7 9 13 12] ;
iwant = A(ismember(A,B))

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