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In mathematics, the indicator vector or characteristic vector or incidence vector of a subset T of a set S is the vector such that if and if If S is countable and its elements are numbered so that , then where if and if To put it more simply, the indicator vector of T is a vector with one element for each element in S, with that element being one if the corresponding element of S is in T, and zero if it is not. An indicator vector is a special (countable) case of an indicator function.
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