Source code for monty.math

# coding: utf-8

from __future__ import division, unicode_literals, absolute_import

"""
Addition math functions.
"""

__author__ = 'Shyue Ping Ong'
__copyright__ = 'Copyright 2013, The Materials Virtual Lab'
__version__ = '0.1'
__maintainer__ = 'Shyue Ping Ong'
__email__ = 'ongsp@ucsd.edu'
__date__ = '10/28/14'


import math


[docs]def nCr(n, r): """ Calculates nCr. Args: n (int): total number of items. r (int): items to choose Returns: nCr. """ f = math.factorial return int(f(n) / f(r) / f(n-r))
[docs]def nPr(n, r): """ Calculates nPr. Args: n (int): total number of items. r (int): items to permute Returns: nPr. """ f = math.factorial return int(f(n) / f(n-r))