scipy.special.polygamma#
- scipy.special.polygamma(n, x)[source]#
Polygamma functions.
Defined as \(\psi^{(n)}(x)\) where \(\psi\) is the
digamma
function. See [dlmf] for details.- Parameters
- narray_like
The order of the derivative of the digamma function; must be integral
- xarray_like
Real valued input
- Returns
- ndarray
Function results
See also
References
- dlmf
NIST, Digital Library of Mathematical Functions, https://dlmf.nist.gov/5.15
Examples
>>> from scipy import special >>> x = [2, 3, 25.5] >>> special.polygamma(1, x) array([ 0.64493407, 0.39493407, 0.03999467]) >>> special.polygamma(0, x) == special.psi(x) array([ True, True, True], dtype=bool)