Incomplete Gamma Function a x actual gcf(a,x) gammln(a) gln 0.10 1.581139 0.010104 0.010104 2.252713 2.252713 0.50 3.535534 0.007834 0.007834 0.572365 0.572365 1.00 5.000000 0.006738 0.006738 0.000000 0.000000 1.10 5.244044 0.006657 0.006658 -0.049872 -0.049872 2.00 7.071068 0.006855 0.006855 0.000000 0.000000 6.00 12.247449 0.017406 0.017406 4.787492 4.787492 11.00 16.583124 0.059573 0.059573 15.104413 15.104413 41.00 44.821869 0.264029 0.264029 110.320641 110.320641