betaLn function

double betaLn(
  1. num x,
  2. num y
)

Logarithm of the beta function based on the gammaLn function.

Implementation

double betaLn(num x, num y) =>
    x <= 0 || y <= 0 ? double.nan : gammaLn(x) + gammaLn(y) - gammaLn(x + y);