Gamma Function x actual gammln(x) 1.00 0.000000 0.000000 1.20 -0.085374 -0.085374 1.40 -0.119613 -0.119613 1.60 -0.112592 -0.112592 1.80 -0.071084 -0.071084 2.00 0.000000 0.000000 0.20 1.524064 1.524064 0.40 0.796678 0.796678 0.60 0.398234 0.398234 0.80 0.152060 0.152060 10.00 12.801827 12.801827 20.00 39.339884 39.339886 30.00 71.257039 71.257042