Groups > comp.lang.java.programmer > #7779

Re: higher precision doubles

From	"Nasser M. Abbasi" <nma@12000.org>
Newsgroups	comp.lang.java.programmer
Subject	Re: higher precision doubles
Date	2011-09-10 21:53 -0700
Organization	Aioe.org NNTP Server
Message-ID	<j4hev1$lho$1@speranza.aioe.org> (permalink)
References	<j1hqc1$1ch$1@news.albasani.net> <strictfp-20110806003831@ram.dialup.fu-berlin.de> <j1k4db$1n2$1@news.albasani.net>

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On 8/6/2011 12:24 PM, Jan Burse wrote:
>
>
> 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:
>
...
  
>
>
>       zero1=-2.4492935982947064E-16
>       zero2=-2.4492935982947064E-16

Well, both as not correct :)

Here is the correct math answer

Mathematica:

x = Sin[2 Pi]
      
     0

An exact zero. As was created by God. Not a floating point zero.

--Nasser

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Re: higher precision doubles "Nasser M. Abbasi" <nma@12000.org> - 2011-09-10 21:53 -0700
  Re: higher precision doubles Lew <lewbloch@gmail.com> - 2011-09-10 22:22 -0700
    Re: higher precision doubles "John B. Matthews" <nospam@nospam.invalid> - 2011-09-11 05:36 -0400
    Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-09-11 13:29 +0200
      Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-09-11 13:50 +0200
        Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-09-11 14:09 +0200
  Re: higher precision doubles Jan Burse <janburse@fastmail.fm> - 2011-09-11 10:59 +0200

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