Re: [boost] uniform_real rather alarmingly non-random?

From: John Maddock (john_at_[hidden])
Date: 2006-03-18 08:54:07

> This seems to be dependant on the type of generator you use. Try using
> lagged_fibonacci. The casting and dividing involved in uniform_real
> appears to loose a lot of accuracy, but lagged_fibonacci generates
> doubles between 0 and 1, so there's no cast and it's dividing by 1.

Just a quick update for those who are interested: using lagged_fibonacci 
does indeed solve the problem and allows the iostreams code I posted earlier 
to detect the VC8 streaming problem.

Unfortunately lagged_fibonacci isn't part of TR1: the only real number 
generator that is (subtract_with_carry_01) appears to still leave the final 
4 bits as zero :-(

John.