On Sun, 21 Sep 2014, Stéphane Rollandin wrote:

> Hello,
>
> (Random seed: 16457315536128) nextInt: 11
>
> gives -1853
>
>
> Am I missing something ?

It's not documented, but this generator[1] is designed to work with 32 bit 
integers. #nextValue generates 31 bit integers between 1 and 2147483647.
This actually breaks #next, which returns a value from (0..1] instead 
of [0..1).

Based on the math in #nextValue seeds up to 96752654378 are safe, but 
96752654379 will underflow. I suggest you to use 31 bit nonnegative 
integers as seed.


Levente

[1] http://www.cems.uwe.ac.uk/~irjohnso/coursenotes/ufeen8-15-m/p1192-parkmiller.pdf

>
> Stef
>
>