OpenEuphoria

Re: 32-bit random numbers

• Posted by "Juergen Luethje" <j.lue at gmx.de> Jul 05, 2004
• 549 views

Christian Cuvier wrote:

>> *Concatenation* of two uniformly distributed 16-bit values -- as Derek
>> and Rob suggested -- should IMHO result in a uniform distribution, too.
>>
>> Rob said, that *addition* of two uniformly distributed values does
>> result in a distribution, that is not uniform.
>>
>> Regards,
>>    Juergen
>
> Rob also said that, in theory, concatenation would be nice. The problem is
> concatenating adjacent random numbers, because the random generator is
> actually deterministic. For this reason, only 2^16 among all possible 2^32
> integers will be generated.

Maybe not all possible 2^32 integers will be generated, but why exactly
2^16? Also, when using the fancy code in combination with set_rand()
that Derek posted, no *adjacent* random numbers are concatenated.

My text that you quoted above, was a reply to Pete, when he wrote:
"As I think was said, I would also have noted that #00010001, #00020002,
etc will be less likely."
Sorry, I still don't see the reason why e.g. #00010001 would be less
likely than any other value, when concatenating 2 uniformly distributed
16-bit random numbers.

<snip>

Regards,
   Juergen