[Python-checkins] r88183 - python/branches/py3k/Doc/whatsnew/3.2.rst
raymond.hettinger
python-checkins at python.org
Tue Jan 25 07:58:01 CET 2011
Author: raymond.hettinger
Date: Tue Jan 25 07:58:01 2011
New Revision: 88183
Log:
Add math.erfc and turtledemo.
Modified:
python/branches/py3k/Doc/whatsnew/3.2.rst
Modified: python/branches/py3k/Doc/whatsnew/3.2.rst
==============================================================================
--- python/branches/py3k/Doc/whatsnew/3.2.rst (original)
+++ python/branches/py3k/Doc/whatsnew/3.2.rst Tue Jan 25 07:58:01 2011
@@ -993,10 +993,15 @@
0.013765762467652909
The :func:`~math.erf` function computes a probability integral or `Gaussian
-error function <http://en.wikipedia.org/wiki/Error_function>`_:
+error function <http://en.wikipedia.org/wiki/Error_function>`_. The
+complementary error function, :func:`~math.erfc`, is ``1 - erf(x)``:
>>> erf(1.0/sqrt(2.0)) # portion of normal distribution within 1 standard deviation
0.682689492137086
+>>> erfc(1.0/sqrt(2.0)) # portion of normal distribution outside 1 standard deviation
+0.31731050786291404
+>>> erf(1.0/sqrt(2.0)) + erfc(1.0/sqrt(2.0))
+1.0
The :func:`~math.gamma` function is a continuous extension of the factorial
function. See http://en.wikipedia.org/wiki/Gamma_function for details. Because
@@ -1967,6 +1972,16 @@
(Work by Nick Coghlan, Dan Mahn, and Senthil Kumaran in :issue:`2987`,
:issue:`5468`, and :issue:`9873`.)
+turtledemo
+----------
+
+The demonstration code for the :mod:`turtle` module was moved from the *Demo*
+directory to main library. It includes over a dozen sample scripts with
+lively displays. Being on :attr:`sys.path`, it can now be run directly
+from the command-line::
+
+ $ python -m turtledemo
+
Multi-threading
===============
@@ -2166,7 +2181,7 @@
:pep:`385` for details.
To learn to use the new version control system, see the `tutorial by Joel
-Spolsky <http://hginit.com>`_ or the `guide to Mercurial workflows
+Spolsky <http://hginit.com>`_ or the `Guide to Mercurial Workflows
<http://mercurial.selenic.com/guide/>`_.
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