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indexin

indexin(a, b)

Returns a vector containing the highest index in b for each value in a that is a member of b . The output vector contains 0 wherever a is not a member of b.

Examples

julia> indexin([1, 2, 3], [3, 2, 1, 4])
3-element Array{Int64,1}:
 3
 2
 1

julia> indexin(["apple", "banana", "orange"], ["orange", "apple", "grape"])
3-element Array{Int64,1}:
 2
 1
 0

julia> indexin([true, false, true], [false, true])
3-element Array{Int64,1}:
 2
 1
 0

Common mistake example:

julia> indexin([1, 2, 3], [])
3-element Array{Int64,1}:
 0
 0
 0

In this example, the second argument b is an empty array. As a result, all elements of a are not members of b, and the output vector contains only zeros. Make sure to provide a non-empty array for b to get meaningful results from indexin.

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