From: ksmakoto@...4u.or.jp
Date: 2016-12-30T12:53:49+00:00
Subject: [ruby-core:78916] [Ruby trunk Bug#13078] with Integer a and b, a.fdiv(b) sometimes inaccurate than Rational(a, b).to_f

Issue #13078 has been updated by Makoto Kishimoto.


pull requested
https://github.com/ruby/ruby/pull/1508

----------------------------------------
Bug #13078: with Integer a and b, a.fdiv(b) sometimes inaccurate than Rational(a, b).to_f
https://bugs.ruby-lang.org/issues/13078#change-62331

* Author: Makoto Kishimoto
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
For example,

~~~
a = 3
b = 0x20_0000_0000_0001
p a.fdiv(b)
p Rational(a, b).to_f

#=>
3.3306690738754696e-16
3.330669073875469e-16
~~~
I'm hacking to solve this problem, see diff view.
https://github.com/ruby/ruby/compare/trunk...metanest:fdiv_spike



-- 
https://bugs.ruby-lang.org/

Unsubscribe: <mailto:ruby-core-request@ruby-lang.org?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>