 
 
 
The igamma command takes two mandatory arguments and an
optional third argument. The mandatory arguments are a number a
and a number b≥ 0. An optional third argument of 1 will
return a normalized version of the function.
igamma returns the value of the incomplete γ
function,
| γ(a,b) = | ∫ | 
 | e−tta−1 dt. | 
With a third argument of 1, the value returned will be normalized;
namely divided by Γ(a).
Input:
Output:
Input:
Output:
Input:
Output:
since Γ(4) = 6 and 2.11660866731/6 = 0.352768111218.
 
 
