This is documentation for an old release of SciPy (version 0.13.0). Read this page Search for this page in the documentation of the latest stable release (version 1.15.1).

scipy.special.betaln

scipy.special.betaln(x1, x2[, out]) = <ufunc 'betaln'>

y=betaln(a,b) returns the natural logarithm of the absolute value of beta: ln(abs(beta(x))).