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{{alias}}( x )
Evaluates the natural logarithm of the factorial of `x`.
For input values other than negative integers, the function returns
ln( x! ) = ln( Γ(x+1) )
where `Γ` is the Gamma function. For negative integers, the function returns
`NaN`.
If provided `NaN`, the function returns `NaN`.
Parameters
----------
x: number
Input value.
Returns
-------
y: number
Natural logarithm of the factorial of `x`.
Examples
--------
> var y = {{alias}}( 3.0 )
~1.792
> y = {{alias}}( 2.4 )
~1.092
> y = {{alias}}( -1.0 )
NaN
> y = {{alias}}( -1.5 )
~1.266
> y = {{alias}}( NaN )
NaN
See Also
--------
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