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6.3.15  Lower incomplete γ function

The lower incomplete γ function is defined by

γ(a,b)=
b


0
 et ta−1 dt

The igamma command computes the lower incomplete γ function.

Examples

igamma(4.0,3.0)
     
2.11660866731           
igamma(4.0,3.0,1)
     
0.352768111218           

since Γ(4)=6 and 2.11660866731/6=0.352768111218.


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