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

References

dlmf

NIST, Digital Library of Mathematical Functions, https://dlmf.nist.gov/5.15