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

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This commit is contained in:
Raymond Hettinger 2011-03-22 15:52:46 -07:00
parent b76f6200d2
commit 405a4717e1
2 changed files with 10 additions and 4 deletions
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6
Lib/random.py
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@ -490,6 +490,12 @@ class Random(_random.Random):
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