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{{alias}}( n, x )
Evaluates the polygamma function of order `n`; i.e., the (n+1)th derivative
of the natural logarithm of the gamma function.
If `n` is not a nonnegative integer, the function returns `NaN`.
If `x` is zero or a negative integer, the function returns `NaN`.
If provided `NaN` as either parameter, the function returns `NaN`.
Parameters
----------
n: integer
Derivative order.
x: number
Input value.
Returns
-------
y: number
Function value.
Examples
--------
> var v = {{alias}}( 3, 1.2 )
~3.245
> v = {{alias}}( 5, 1.2 )
~41.39
> v = {{alias}}( 3, -4.9 )
~60014.239
> v = {{alias}}( -1, 5.3 )
NaN
> v = {{alias}}( 2, -1.0 )
Infinity
See Also
--------
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