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authorRaymond Hettinger <python@rcn.com>2011-03-22 22:57:03 (GMT)
committerRaymond Hettinger <python@rcn.com>2011-03-22 22:57:03 (GMT)
commit09cbadd0057a74d79f0df0ac5aa1f49d3384e2f6 (patch)
treec8388065315ab1242d358bf7f029fe7a13ebbcfe /Lib/random.py
parent1aa8743d1c0a054ac2dfbcd8ca8896fdd06e1b8b (diff)
parent27f870982fe4fefb2e877a101a219915e620421b (diff)
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Issue 10787: Document the probability density function for random.gammavariate.
Diffstat (limited to 'Lib/random.py')
-rw-r--r--Lib/random.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/Lib/random.py b/Lib/random.py
index f29803e..3d2af24 100644
--- a/Lib/random.py
+++ b/Lib/random.py
@@ -465,6 +465,12 @@ 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