scipy.special.gammaln

scipy.special.gammaln(x, /, out=None, *, where=True, casting='same_kind', order='K', dtype=None, subok=True[, signature, extobj]) = <ufunc 'gammaln'>

Logarithm of the absolute value of the Gamma function.

Parameters

xarray-like

Values on the real line at which to compute gammaln

Returns

gammalnndarray

Values of gammaln at x.

See also

gammasgn

sign of the gamma function

loggamma

principal branch of the logarithm of the gamma function

Notes

When used in conjunction with gammasgn, this function is useful for working in logspace on the real axis without having to deal with complex numbers, via the relation exp(gammaln(x)) = gammasgn(x)*gamma(x).

For complex-valued log-gamma, use loggamma instead of gammaln.