From: Fernando Cacciola (fernando_cacciola_at_[hidden])
Date: 2003-12-20 20:13:41
"Paul A. Bristow" <boost_at_[hidden]> escribió en el mensaje
> | -----Original Message-----
> | From: boost-bounces_at_[hidden]
> | [mailto:boost-bounces_at_[hidden]]On Behalf Of Fernando Cacciola
> | Sent: Friday, December 19, 2003 2:38 PM
> | To: boost_at_[hidden]
> | Subject: [boost] Re: Nuemric Conversion review
> || > > > The section "Exact, Correctly Rounded and Out-Of-Range
> | > > > mentions 1 ulp, but that has not been defined anywhere.
> | ulp = unit in the last place
> | It's the number formed by a single 1 in the mantissa.
> | This definiton is independent of the exponent, so the actual
> | "magnitude" of 1 ulp depends on the exponent. Its a relative quantity.
> PC term for mantissa seems to "significand".
> I am correct is equating this to 'lesat significant (binary) digit".
> It might be helpful to give as examples what it for two doubles as
> what the relative quantity (ratio).
> Also to note that usually significand is binary and so ulp a binary 1.
> And that the soon to be standard (I think) function nextafter will produce
> value which is 1 ulp more or less.
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