This Gamma(x) is traceable, simple/visible to implement.
Sanity check Mathcad 11, Keisan.
Very fast for the two applications.
The if/otherwise may be refactored.
Comments/contribution ... Welcome.
Cheers ... Jean

Gamma [H.T. Davis] Copy.sm (71 KiB) downloaded 109 time(s).

... refreshed for lot more accurate roots secant

Gamma [H.T. Davis] Copy.sm (81 KiB) downloaded 108 time(s).

Incomplete functions can solve now.



Gamma [H.T. Davis]_overlord.sm (62 KiB) downloaded 106 time(s).
Gamma [H.T. Davis]_overlord.pdf (136 KiB) downloaded 105 time(s).