From: cilibrar@... (Rudi Cilibrasi)
Date: 2003-04-18T08:28:05+09:00
Subject: Re: Roundoff problem with Float and Marshal

nobu.nokada@softhome.net wrote in message news:<200304171653.h3HGrgHQ002407@sharui.nakada.kanuma.tochigi.jp>...
> Since it was wrong a little, I fixed and committed it.

Hmmm interesting numerical developments.  I continue to test it by
doing
a cvs update (with and without the DBL_DIG patch) and do see perhaps
some further problems:

100000.times {
w = rand(111111111)
x = rand(222222223)
y = rand(33333333334)
z = rand(311414313)
a = (x.to_f + y.to_f / z.to_f) * 
  Math.exp(w.to_f / (x.to_f + y.to_f / z.to_f))
ma = Marshal.dump(a)
b = Marshal.load(ma)
if a == b
  puts "Everything is working fine for #{a}"
else
  puts "PROBLEM: a is #{a}, b is #{b}, and ma is #{ma.dump}"
  puts "w is #{w}, x is #{x}, y is #{y}, z is #{z}"
end
}

produces many PROBLEM: lines on my system.