Computer Chess Club Archives


Search

Terms

Messages

Subject: Re: 64-Bit random numbers

Author: martin fierz

Date: 04:00:56 10/29/03

Go up one level in this thread


On October 28, 2003 at 15:01:40, Gerd Isenberg wrote:

>On October 28, 2003 at 14:50:35, Martin Schreiber wrote:
>
>>Hi,
>>
>>For my hash tables I need 64 bit random numbers, but I don't know the source
>>code.
>>I use Dev-C++.
>>Can anybody help me?
>>
>>Martin
>
>This simple one works quite well
>
>UINT32 HashRand32()
>{
>    static UINT32 r = 0;
>    return (r = 1664525L*r + 1013904223L);
>}
>
>...
>hashval = HashRand32();
>hashval = (hashval << 32) | HashRand32();

i use a similar concatenation of random numbers generated with the C rand()
function.

i have never believed all the stuff about "bad" or "good" random numbers for
hashing purposes (of course, for other things it's different...). i also don't
believe this "hamming distance" stuff. i'd be very surprised if any of this made
any difference in practice. has anybody ever tested this?

cheers
  martin



This page took 0 seconds to execute

Last modified: Thu, 15 Apr 21 08:11:13 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.