* [ruby-dev:50281] [Ruby trunk Bug#13986] Integer#fdiv with Complex returns unexpected value
[not found] <redmine.issue-13986.20171007134931@ruby-lang.org>
@ 2017-10-07 13:49 ` 5.5
2017-10-07 23:13 ` [ruby-dev:50282] [Ruby trunk Bug#13986][Feedback] " nobu
2018-10-20 23:55 ` [ruby-dev:50658] [Ruby trunk Bug#13986][Closed] " 5.5
2 siblings, 0 replies; 3+ messages in thread
From: 5.5 @ 2017-10-07 13:49 UTC (permalink / raw)
To: ruby-dev
Issue #13986 has been reported by 5.5 (5 5).
----------------------------------------
Bug #13986: Integer#fdiv with Complex returns unexpected value
https://bugs.ruby-lang.org/issues/13986
* Author: 5.5 (5 5)
* Status: Open
* Priority: Normal
* Assignee:
* Target version:
* ruby -v: ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-darwin15]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
Ruby 2.4 では,`Integer#fdiv` に `Complex` オブジェクトを与えると,期待と違う値が得られる場合があります。
```rb
p 1.fdiv(1+0i) #=> -1.404447761611185e+306
p 1.fdiv(1i) #=> -1.0e-323
```
期待は,それぞれ
```rb
Complex(1.0, 0.0)
Complex(0.0, -1.0)
```
でした。
Ruby 2.3.3 では期待のとおりでした。
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
* [ruby-dev:50282] [Ruby trunk Bug#13986][Feedback] Integer#fdiv with Complex returns unexpected value
[not found] <redmine.issue-13986.20171007134931@ruby-lang.org>
2017-10-07 13:49 ` [ruby-dev:50281] [Ruby trunk Bug#13986] Integer#fdiv with Complex returns unexpected value 5.5
@ 2017-10-07 23:13 ` nobu
2018-10-20 23:55 ` [ruby-dev:50658] [Ruby trunk Bug#13986][Closed] " 5.5
2 siblings, 0 replies; 3+ messages in thread
From: nobu @ 2017-10-07 23:13 UTC (permalink / raw)
To: ruby-dev
Issue #13986 has been updated by nobu (Nobuyoshi Nakada).
Description updated
Status changed from Open to Feedback
5.5 (5 5) wrote:
> 期待は,それぞれ
>
> ```ruby
> Complex(1.0, 0.0)
> Complex(0.0, -1.0)
> ```
>
> でした。
2.4の結果がおかしいのは確かですが、その期待は本当に正しいんでしょうか。
ドキュメント上は以下のように単にfloatを返すことになっています。
> int.fdiv(numeric) -> float
>
> Returns the floating point result of dividing `int` by `numeric`.
>
> 654321.fdiv(13731) #=> 47.652829364212366
> 654321.fdiv(13731.24) #=> 47.65199646936475
> -654321.fdiv(13731) #=> -47.652829364212366
trunkでは`Complex(1.0, 0.0).to_f`と同様例外になります。
----------------------------------------
Bug #13986: Integer#fdiv with Complex returns unexpected value
https://bugs.ruby-lang.org/issues/13986#change-67114
* Author: 5.5 (5 5)
* Status: Feedback
* Priority: Normal
* Assignee:
* Target version:
* ruby -v: ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-darwin15]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
Ruby 2.4 では,`Integer#fdiv` に `Complex` オブジェクトを与えると,期待と違う値が得られる場合があります。
```ruby
p 1.fdiv(1+0i) #=> -1.404447761611185e+306
p 1.fdiv(1i) #=> -1.0e-323
```
期待は,それぞれ
```ruby
Complex(1.0, 0.0)
Complex(0.0, -1.0)
```
でした。
Ruby 2.3.3 では期待のとおりでした。
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
* [ruby-dev:50658] [Ruby trunk Bug#13986][Closed] Integer#fdiv with Complex returns unexpected value
[not found] <redmine.issue-13986.20171007134931@ruby-lang.org>
2017-10-07 13:49 ` [ruby-dev:50281] [Ruby trunk Bug#13986] Integer#fdiv with Complex returns unexpected value 5.5
2017-10-07 23:13 ` [ruby-dev:50282] [Ruby trunk Bug#13986][Feedback] " nobu
@ 2018-10-20 23:55 ` 5.5
2 siblings, 0 replies; 3+ messages in thread
From: 5.5 @ 2018-10-20 23:55 UTC (permalink / raw)
To: ruby-dev
Issue #13986 has been updated by 5.5 (5 5).
Status changed from Feedback to Closed
反応が遅くなってすみません。
現行の(修正後の)仕様について、そういうものなのだろう、と納得いたしました。
----------------------------------------
Bug #13986: Integer#fdiv with Complex returns unexpected value
https://bugs.ruby-lang.org/issues/13986#change-74548
* Author: 5.5 (5 5)
* Status: Closed
* Priority: Normal
* Assignee:
* Target version:
* ruby -v: ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-darwin15]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
Ruby 2.4 では,`Integer#fdiv` に `Complex` オブジェクトを与えると,期待と違う値が得られる場合があります。
```ruby
p 1.fdiv(1+0i) #=> -1.404447761611185e+306
p 1.fdiv(1i) #=> -1.0e-323
```
期待は,それぞれ
```ruby
Complex(1.0, 0.0)
Complex(0.0, -1.0)
```
でした。
Ruby 2.3.3 では期待のとおりでした。
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
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2017-10-07 13:49 ` [ruby-dev:50281] [Ruby trunk Bug#13986] Integer#fdiv with Complex returns unexpected value 5.5
2017-10-07 23:13 ` [ruby-dev:50282] [Ruby trunk Bug#13986][Feedback] " nobu
2018-10-20 23:55 ` [ruby-dev:50658] [Ruby trunk Bug#13986][Closed] " 5.5
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