scipy.special.
polygamma#
- scipy.special.polygamma(n, x)[source]#
- Polygamma functions. - Defined as \(\psi^{(n)}(x)\) where \(\psi\) is the - digammafunction. 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)