factorial

relationalai.semantics.std.math

factorial(value: NumberValue) -> Expression

Compute the factorial of a non-negative integer.

Parameters

• value

  (NumberValue) - The non-negative integer input.

Returns

• Expression - An Expression computing the factorial. Returns Integer. If the input value is not statically known to be non-negative, but turns out to be negative at runtime, returns NaN.

Raises

• ValueError - If value can be computed statically and is negative.

Examples

Compute factorial:

>>> select(math.factorial(5))
>>> select(math.factorial(Calculation.n))