Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.java.programmer > #6833
| From | Eric Sosman <esosman@ieee-dot-org.invalid> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: higher precision doubles |
| Date | 2011-08-06 17:33 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <j1kc0r$d9t$1@dont-email.me> (permalink) |
| References | <j1hqc1$1ch$1@news.albasani.net> <strictfp-20110806003831@ram.dialup.fu-berlin.de> <j1k4db$1n2$1@news.albasani.net> |
On 8/6/2011 3:24 PM, Jan Burse wrote:
> Stefan Ram schrieb:
>> Jan Burse<janburse@fastmail.fm> writes:
>>> IEEE allows to internally calculate with additional bits.
>>> Is it possible to have awailable these ops? Like an add
>>> with this higher precision? How could we store such a
>>> result? Would there be a wrapper like Double?
>>
>> See also:
>>
>> http://en.wikipedia.org/wiki/Strictfp
>>
>> .
>>
>
> Motivating example, in Go we have:
>
> func main() {
> x := math.Sin(2*math.Pi)
> fmt.Printf("x = %.30f, is zero = %v\n", x, x == 0)
> }
>
> x = 0.000000000000000000000000000000, is zero = true
>
> In Java we have:
>
>
> public static double zero1() {
> return Math.sin(2*Math.PI);
> }
>
> public static double zero2() {
> return StrictMath.sin(2*StrictMath.PI);
> }
>
> public static void main(String[] args) {
> System.out.println("zero1="+zero1());
> System.out.println("zero2="+zero2());
> }
>
> zero1=-2.4492935982947064E-16
> zero2=-2.4492935982947064E-16
(Shrug.) Since {Mm}ath.P{Ii} is inexact in both languages --
and in any language whatsoever that uses base-N floating-point
with any precision you care to name -- the "correct" answer from
Go is more a matter of coincidence than of anything important.
--
Eric Sosman
esosman@ieee-dot-org.invalid
Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar
higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-06 00:20 +0200
Re: higher precision doubles Patricia Shanahan <pats@acm.org> - 2011-08-06 03:35 -0700
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-06 13:03 +0200
Re: higher precision doubles BGB <cr88192@hotmail.com> - 2011-08-06 12:20 -0700
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-06 23:30 +0200
Re: higher precision doubles BGB <cr88192@hotmail.com> - 2011-08-06 16:12 -0700
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-07 01:35 +0200
Re: higher precision doubles BGB <cr88192@hotmail.com> - 2011-08-06 19:26 -0700
Re: higher precision doubles supercalifragilisticexpialadiamaticonormalizeringelimatisticantations <supercalifragilisticexpialadiamaticonormalizeringelimatisticantations@averylongandannoyingdomainname.com> - 2011-08-09 00:42 -0400
Re: higher precision doubles Patricia Shanahan <pats@acm.org> - 2011-08-09 04:07 -0700
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-09 14:00 +0200
Re: higher precision doubles Patricia Shanahan <pats@acm.org> - 2011-08-09 09:07 -0700
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-10 08:50 +0200
Re: higher precision doubles supercalifragilisticexpialadiamaticonormalizeringelimatisticantations <supercalifragilisticexpialadiamaticonormalizeringelimatisticantations@averylongandannoyingdomainname.com> - 2011-08-10 20:16 -0400
Re: higher precision doubles Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-08-09 10:11 -0500
Re: higher precision doubles Arne Vajhøj <arne@vajhoej.dk> - 2011-08-09 22:40 -0400
Re: higher precision doubles Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-08-09 22:06 -0500
Re: higher precision doubles BGB <cr88192@hotmail.com> - 2011-08-10 08:53 -0700
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-06 21:24 +0200
Re: higher precision doubles markspace <-@.> - 2011-08-06 13:29 -0700
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-06 23:20 +0200
Re: higher precision doubles markspace <-@.> - 2011-08-06 15:43 -0700
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-07 01:06 +0200
Re: higher precision doubles Patricia Shanahan <pats@acm.org> - 2011-08-06 16:21 -0700
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-07 01:34 +0200
Re: higher precision doubles Patricia Shanahan <pats@acm.org> - 2011-08-06 21:32 -0700
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-07 17:24 +0200
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-07 17:39 +0200
Re: higher precision doubles Patricia Shanahan <pats@acm.org> - 2011-08-07 09:26 -0700
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-07 21:23 +0200
Re: higher precision doubles Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-08-07 20:48 -0400
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-08 09:05 +0200
Re: higher precision doubles Patricia Shanahan <pats@acm.org> - 2011-08-08 05:37 -0700
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-08 19:08 +0200
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-08 19:16 +0200
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-08 19:29 +0200
Re: higher precision doubles Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-08-08 21:34 -0500
Re: higher precision doubles BGB <cr88192@hotmail.com> - 2011-08-08 13:49 -0700
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-09 01:08 +0200
Re: higher precision doubles BGB <cr88192@hotmail.com> - 2011-08-09 02:44 -0700
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-09 12:52 +0200
Re: higher precision doubles BGB <cr88192@hotmail.com> - 2011-08-09 13:15 -0700
Re: higher precision doubles BGB <cr88192@hotmail.com> - 2011-08-07 13:51 -0700
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-07 01:59 +0200
Re: higher precision doubles Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-08-08 21:03 -0500
Re: higher precision doubles Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-08-06 17:33 -0400
Re: higher precision doubles Patricia Shanahan <pats@acm.org> - 2011-08-06 14:51 -0700
Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-08-07 00:57 +0200
csiph-web