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ApproximateFactorial function

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Fully qualified name: Std.Math.ApproximateFactorial

function ApproximateFactorial(n : Int) : Double

Summary

Returns an approximate factorial of a given number.

Description

Returns the factorial as Double, given an input n. The domain of inputs for this function is n <= 169.

Remarks

For n > 10, this function uses the Ramanujan approximation with a relative error of the order of 1 / n⁵.

Input

n

The number to take the approximate factorial of. Must not be negative.

Output

The approximate factorial of n.

See Also

  • Microsoft.Quantum.Math.FactorialI
  • Microsoft.Quantum.Math.FactorialL