From: Bill Schottstaedt <bil@ccrma.Stanford.EDU>
Cc: guile-devel@gnu.org
Subject: Re: ratio implementation
Date: Wed, 15 Oct 2003 05:57:58 -0700 [thread overview]
Message-ID: <3F8D4456.40801@ccrma> (raw)
In-Reply-To: <ljk778ynrm.fsf@troy.dt.e-technik.uni-dortmund.de>
> With your new files, I now get
> guile> (inexact->exact 123456789123456789.0)
> 0
I noticed this, but wasn't sure how to proceed;
in the previous guile, you'd get (in a sense) equally
bogus results:
guile> (inexact->exact 17452826108659293487.0)
17452826108659294208
guile> (= (truncate 17452826108659293487.3) 17452826108659293487.0)
#f
I wasn't even sure whether you wanted inexact->exact to
be changed -- I left the old code in place.
I wrote a gmp version of the continued fraction code about
10 years ago -- I think I can still find it.
> guile> (define pi (* 2 (acos 0)))
> guile> (- (inexact->exact pi) pi)
> 3.31628058347633e-10
> Shouldn't we be able to do better than this?
I think so; but in the current version, I'm setting the
minimum error to 1/INT_MAX, which looks like it's in the
ballpark of e-10.
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next prev parent reply other threads:[~2003-10-15 12:57 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-28 11:24 ratio implementation Bill Schottstaedt
2003-07-28 12:08 ` Han-Wen Nienhuys
2003-07-29 0:41 ` Kevin Ryde
2003-07-29 11:57 ` Bill Schottstaedt
2003-07-30 22:42 ` Kevin Ryde
2003-09-15 10:35 ` Marius Vollmer
2003-09-15 16:19 ` Rob Browning
2003-09-15 22:06 ` Dirk Herrmann
2003-09-15 22:59 ` Kevin Ryde
2003-09-16 11:39 ` Bill Schottstaedt
2003-09-16 21:36 ` Rob Browning
2003-09-18 21:09 ` Dirk Herrmann
2003-10-07 15:26 ` Marius Vollmer
2003-10-13 10:58 ` Bill Schottstaedt
2003-10-14 8:57 ` Marius Vollmer
2004-02-18 14:25 ` fractions.test Bill Schottstaedt
2003-10-14 12:39 ` ratio implementation Marius Vollmer
2003-10-14 22:56 ` Kevin Ryde
2003-10-14 13:03 ` Marius Vollmer
2003-10-14 23:37 ` Kevin Ryde
2003-10-16 11:49 ` Bill Schottstaedt
2003-10-17 10:09 ` Marius Vollmer
2003-10-17 11:47 ` Bill Schottstaedt
2003-10-17 15:04 ` Rob Browning
2003-10-18 0:45 ` Kevin Ryde
2003-10-15 12:57 ` Bill Schottstaedt [this message]
2003-10-17 10:20 ` Marius Vollmer
2003-10-17 15:14 ` Rob Browning
2003-10-17 15:42 ` Marius Vollmer
2003-10-14 23:01 ` Kevin Ryde
2003-10-18 0:55 ` ash using shifts (was: ratio implementation) Kevin Ryde
2003-10-07 15:24 ` ratio implementation Marius Vollmer
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