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5.9.14  The upper incomplete γ function: ugamma

The ugamma command takes two arguments, a number a and a number b≥ 0.
ugamma returns the value of the upper incomplete γ function,

Γ(a,b) = 
+∞


b
 etta−1 dt.

Input:

ugamma(3.0,2.0)

Output:

1.35335283237

Input:

ugamma(-1.3,2)

Output:

0.0142127568837

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