mars.tensor.special.polygamma#
- mars.tensor.special.polygamma(a, b, **kwargs)[source]#
Polygamma functions.
Defined as \(\psi^{(n)}(x)\) where \(\psi\) is the digamma function. See [dlmf] for details.
- Parameters
n (array_like) – The order of the derivative of the digamma function; must be integral
x (array_like) – Real valued input
- Returns
Function results
- Return type
ndarray
See also
References
- dlmf
NIST, Digital Library of Mathematical Functions, https://dlmf.nist.gov/5.15