mirror of https://github.com/python/cpython
Add math.erfc and turtledemo.
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@ -993,10 +993,15 @@ of nearly equal quantities:
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0.013765762467652909
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0.013765762467652909
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The :func:`~math.erf` function computes a probability integral or `Gaussian
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The :func:`~math.erf` function computes a probability integral or `Gaussian
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error function <http://en.wikipedia.org/wiki/Error_function>`_:
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error function <http://en.wikipedia.org/wiki/Error_function>`_. The
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complementary error function, :func:`~math.erfc`, is ``1 - erf(x)``:
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>>> erf(1.0/sqrt(2.0)) # portion of normal distribution within 1 standard deviation
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>>> erf(1.0/sqrt(2.0)) # portion of normal distribution within 1 standard deviation
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0.682689492137086
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0.682689492137086
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>>> erfc(1.0/sqrt(2.0)) # portion of normal distribution outside 1 standard deviation
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0.31731050786291404
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>>> erf(1.0/sqrt(2.0)) + erfc(1.0/sqrt(2.0))
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1.0
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The :func:`~math.gamma` function is a continuous extension of the factorial
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The :func:`~math.gamma` function is a continuous extension of the factorial
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function. See http://en.wikipedia.org/wiki/Gamma_function for details. Because
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function. See http://en.wikipedia.org/wiki/Gamma_function for details. Because
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@ -1967,6 +1972,16 @@ parameters, the return types will also be an ASCII-encoded byte strings:
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(Work by Nick Coghlan, Dan Mahn, and Senthil Kumaran in :issue:`2987`,
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(Work by Nick Coghlan, Dan Mahn, and Senthil Kumaran in :issue:`2987`,
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:issue:`5468`, and :issue:`9873`.)
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:issue:`5468`, and :issue:`9873`.)
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turtledemo
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----------
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The demonstration code for the :mod:`turtle` module was moved from the *Demo*
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directory to main library. It includes over a dozen sample scripts with
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lively displays. Being on :attr:`sys.path`, it can now be run directly
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from the command-line::
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$ python -m turtledemo
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Multi-threading
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Multi-threading
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===============
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===============
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@ -2166,7 +2181,7 @@ members of the community to create and share external changesets. See
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:pep:`385` for details.
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:pep:`385` for details.
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To learn to use the new version control system, see the `tutorial by Joel
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To learn to use the new version control system, see the `tutorial by Joel
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Spolsky <http://hginit.com>`_ or the `guide to Mercurial workflows
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Spolsky <http://hginit.com>`_ or the `Guide to Mercurial Workflows
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<http://mercurial.selenic.com/guide/>`_.
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<http://mercurial.selenic.com/guide/>`_.
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