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Indicator vector
In mathematics, the indicator vector, characteristic vector, or incidence vector of a subset T of a set S is the vector x T := ( x s ) s ∈ S {\displaystyle x_{T}:=(x_{s})_{s\in S}} such that x s = 1 {\displaystyle x_{s}=1} if s ∈ T {\displaystyle s\in T} and x s = 0 {\displaystyle x_{s}=0} if s ∉ T . {\displaystyle s\notin T.}
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