Using a continued fraction representation, these functions can be quickly numerically evaluated in O(max⁡(a,b) MathType@MTEF@5@5@+=feaafiart1ev1aaatCvAUfKttLearuWrP9MDH5MBPbIqV92AaeXatLxBI9gBaebbnrfifHhDYfgasaacH8akY=wiFfYdH8Gipec8Eeeu0xXdbba9frFj0=OqFfea0dXdd9vqai=hGuQ8kuc9pgc9s8qqaq=dirpe0xb9q8qiLsFr0=vr0=vr0dc8meaabaqaciaacaGaaeqabaqabeGadaaakeaadaGcaaqaaiGbc2gaTjabcggaHjabcIha4jabcIcaOiabdggaHjabcYcaSiabdkgaIjabcMcaPaWcbeaaaaa@3617@) in the worst case [15, Chapter 6].