[Python-checkins] cpython (2.7): Add info from the docstring for random.gammavariate() to the docs.

[georg.brandl]

http://hg.python.org/cpython/rev/169e07315ba5
changeset:   72395:169e07315ba5
branch:      2.7
parent:      72390:b5f4c4085ae6
user:        Georg Brandl <georg at python.org>
date:        Sat Sep 17 20:36:28 2011 +0200
summary:
  Add info from the docstring for random.gammavariate() to the docs.

files:
  Doc/library/random.rst |  7 +++++++
  1 files changed, 7 insertions(+), 0 deletions(-)


diff --git a/Doc/library/random.rst b/Doc/library/random.rst
--- a/Doc/library/random.rst
+++ b/Doc/library/random.rst
@@ -196,6 +196,7 @@
    The end-point value ``b`` may or may not be included in the range
    depending on floating-point rounding in the equation ``a + (b-a) * random()``.
 
+
 .. function:: triangular(low, high, mode)
 
    Return a random floating point number *N* such that ``low <= N <= high`` and
@@ -226,6 +227,12 @@
    Gamma distribution.  (*Not* the gamma function!)  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
+
 
 .. function:: gauss(mu, sigma)
 

-- 
Repository URL: http://hg.python.org/cpython