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A fast way to calculate binomial coefficients in python (Andrew Dalke)
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| def binomial(n, k): | |
| """ | |
| A fast way to calculate binomial coefficients by Andrew Dalke. | |
| See http://stackoverflow.com/questions/3025162/statistics-combinations-in-python | |
| """ | |
| if 0 <= k <= n: | |
| ntok = 1 | |
| ktok = 1 | |
| for t in xrange(1, min(k, n - k) + 1): | |
| ntok *= n | |
| ktok *= t | |
| n -= 1 | |
| return ntok // ktok | |
| else: | |
| return 0 |
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