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{{Primitive|?|Roll}} is a [[monadic]] [[scalar function]] which returns random or pseudo-random numbers. Each [[scalar]] in the argument must be a non-negative integer. If it is a positive number <source | {{Primitive|?|Roll}} is a [[monadic]] [[scalar function]] which returns random or pseudo-random numbers. Each [[scalar]] in the argument must be a non-negative integer. If it is a positive number <source lang=apl inline>n</source>, then Roll chooses one of the first <source lang=apl inline>n</source> [[Index|indices]], and if it is zero, then Roll chooses a floating-point number between 0 and 1. | ||
== Examples == | == Examples == | ||