`scipy.special._basic:polygamma`

Signature

def polygamma(n, x)

Polygamma functions.

Defined as $ψ^{(n)} (x)$ where $ψ$ is the digamma function. See [dlmf] for details.

n : array_like: The order of the derivative of the digamma function; must be integral
x : array_like: Real valued input

from scipy import special
x = [2, 3, 25.5]

✓

special.polygamma(1, x)
special.polygamma(0, x) == special.psi(x)

✗

array([ True,  True,  True])