def _argcheck(self, c, a, b):
self.c = c
self.a = a
self.b = b
self._Fa, self._Fb = loggamma.cdf([a, b], c)
self._delta = self._Fb - self._Fa
return (b > a)
def _cdf(self, x, c, a, b):
return (loggamma.cdf(x, c) - self._Fa) / self._delta
