>     you should probably use the Ziggurat method for generating the random
>     values; the ratio method is very slow. (That, and you should not
>     do a divide per nextDouble()!)
>  2. There's absolutely no point in counting downwards in a loop that doesn't
>     use its index; it doesn't buy any speed, and has not since sometime
>     during the nineties. The compiler is able to do such transformations if
>     it is a win.