Author: David Rasmussen
Date: 14:54:11 05/22/01
Go up one level in this thread
On May 22, 2001 at 16:26:10, David Rasmussen wrote: >On May 22, 2001 at 09:52:11, Gian-Carlo Pascutto wrote: > >>On May 22, 2001 at 09:43:49, Robert Hyatt wrote: >> >>>>2) How to generate a 64 bit random number? (I use ran()*ran(). Is it OK?). >>> > >Ran*Ran is not OK, as it will favor the higher bits. > >>>I would use ran()<<32 + ran myself. >> >>Just make sure you package your own ran(). The quality of C >>libraries one will vary greatly. >> >>I did a test with 32 bit hashes and MSVC: average hamming distance >>of 9.30, whereas my own (which I stole from Crafty, which stole it from...) >>got 15.99, which is theoretically optimal I suppose. >> > I measured my numbers. My minimum distance is 16, and my average distance is 31.9997 . Are we talking about different things here?
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