SciPy

This is documentation for an old release of SciPy (version 0.17.1). Read this page in the documentation of the latest stable release (version 1.15.1).

scipy.special.digamma

scipy.special.digamma(z) = <ufunc 'psi'>

Digamma function

The derivative of the logarithm of the gamma function evaluated at z (also called the digamma function).