Parent Directory | Revision Log | Patch
revision 1.1 by tjl, Mon May 19 19:50:01 2003 UTC | revision 1.2 by tjl, Mon May 19 19:51:05 2003 UTC | |
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# | Line 1 | Line 1 |
1 | from math import * | from math import * |
2 | ||
3 | def log2birthdayprob(n, k): | def log2birthdayprob(n, k): |
4 | """return log2(p(k balls thrown to n bins, all end up alone)) | |
5 | """ | |
6 | return ( | return ( |
7 | (n+.5) * log(n) | (n+.5) * log(n) |
8 | - (n-k+.5) * log(n-k) | - (n-k+.5) * log(n-k) |
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