PyErf

A Pure-Python Error Function and Inverse Error Function Package

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pyerf is a pure-Python implementation of the error function and inverse error function using the same functions that SciPy_ uses (namely parts of the Cephes math library, cprob/ndtr.c_ and cprob/ndtri.c_).

This is a useful package for when you need to calculate some error fuctions but you don't want to install all of the SciPy_/NumPy_ stuff.

Usage

You can import the module:

.. code-block:: python

from pyerf import pyerf pyerf.erfinv(0.5) # 0.476936... pyerf.erf(0.5) # 0.5204998... pyerf.erfc(0.5) # 0.4795001...

or the package:

.. code-block:: python

import pyerf pyerf.erfinv(0.5) # 0.476936... pyerf.erf(0.5) # 0.5204998... pyerf.erfc(0.5) # 0.4795001...

or only a specific function:

.. code-block:: python

from pyerf import erfinv as inverse_error_function inverse_error_function(0.5) # 0.476936...

and lastly, you can even use import * (but that's no longer considered very Pythonic as it pollutes the namespace):

.. code-block:: python

from pyerf import * erfinv(0.5) # 0.476936... erf(0.5) # 0.5204998... erfc(0.5) # 0.4795001...

Changelog

See CHANGELOG.md_.

.. Images and Links

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.. _CHANGELOG.md: https://github.com/dougthor42/PyErf/blob/master/CHANGELOG.md .. _cprob/ndtr.c: https://github.com/jeremybarnes/cephes/blob/master/cprob/ndtr.c .. _cprob/ndtri.c: https://github.com/jeremybarnes/cephes/blob/master/cprob/ndtri.c .. _SciPy: https://www.scipy.org/ .. _NumPy: http://www.numpy.org/