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Issue 10787: Document the probability density function for random.gammavariate.

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Raymond Hettinger 2011-03-22 15:57:03 -07:00
commit 09cbadd005
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6
Lib/random.py
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@ -465,6 +465,12 @@ def gammavariate(self, alpha, beta):
Conditions on the parameters are alpha > 0 and beta > 0.
The probability distribution function is:
x ** (alpha - 1) * math.exp(-x / beta)
pdf(x) = --------------------------------------
math.gamma(alpha) * beta ** alpha
"""
# alpha > 0, beta > 0, mean is alpha*beta, variance is alpha*beta**2