PyErf

A Pure-Python Error Function and Inverse Error Function Package

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:

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:

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:

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):

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

Changelog

See CHANGELOG.md.