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Mathematica > Mathematics and Algorithms > Mathematical Functions > Numerical Functions >

Built-in Mathematica Symbol

DiscreteIndicator

DiscreteIndicator[x, x₁, {u₁, u₂, ...}]
yields the discrete indicator function, equal to

if x=x₁ and

if x=u_i for any i.

DiscreteIndicator[x, x₁, {u₁, u₂, ...}] remains unevaluated if x or x₁ is not any of the u_i. »

Evaluate at discrete points:

Products of indicator functions effectively correspond to an outer product:

Evaluate at discrete points:

Products of indicator functions effectively correspond to an outer product:

Represent nominal terms in fitting results:

See the functional form:

Evaluate the FittedModel at points a and b:

DiscreteIndicator is equivalent to Boole when both values are in the set:

They differ if either of the first two values is not in the set: