# The upper incomplete γ function: ugamma

### 5.8.14 The upper incomplete γ function: ugamma

The upper incomplete γ function is defined by

Γ(a,b) =

∫

+∞
b

e−tta−1 dt.

The ugamma command computes the upper incomplete γ function.

- ugamma takes two arguments:
  - a, a number.
  - b, a positive real number.
- ugamma(a,b) returns the value of Γ(a,b).

#### Examples.

- Input:
  ugamma(3.0,2.0)
  Output:

  1.35335283237

- Input:
  ugamma(-1.3,2)
  Output:

  0.0142127568837