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The gamma distribution depends upon two parameters; A (the shaping parameter) and B (the scaling parameter).
The gamma density function is:
The gamma function Γ(*) is:
If A is an integer then Γ(A)=(A-1)! where x! is factorial x.
When A = 1 this gives an exponential distribution. If you vary A then the shape of the distribution will change. Changing B does not affect the shape of the distribution, just its scale on the x axis.
See random number fill.