* [ruby-core:72879] [Ruby trunk - Bug #11995] [Open] BigDecimal#power fails for some values
[not found] <redmine.issue-11995.20160115151943@ruby-lang.org>
@ 2016-01-15 15:19 ` dolzenko
2016-01-16 2:05 ` [ruby-core:72884] [Ruby trunk - Bug #11995] [Rejected] " nobu
1 sibling, 0 replies; 2+ messages in thread
From: dolzenko @ 2016-01-15 15:19 UTC (permalink / raw
To: ruby-core
Issue #11995 has been reported by Evgeniy Dolzhenko.
----------------------------------------
Bug #11995: BigDecimal#power fails for some values
https://bugs.ruby-lang.org/issues/11995
* Author: Evgeniy Dolzhenko
* Status: Open
* Priority: Normal
* Assignee:
* ruby -v: ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
$ irb -rbigdecimal
> BigDecimal('-0.5').power(BigDecimal('0.2'))
Math::DomainError: Zero or negative argument for log
but
> -0.5**0.2
=> -0.8705505632961241
The same is true for a few other exponent version I have tested. Is that feature or bug?
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 2+ messages in thread
* [ruby-core:72884] [Ruby trunk - Bug #11995] [Rejected] BigDecimal#power fails for some values
[not found] <redmine.issue-11995.20160115151943@ruby-lang.org>
2016-01-15 15:19 ` [ruby-core:72879] [Ruby trunk - Bug #11995] [Open] BigDecimal#power fails for some values dolzenko
@ 2016-01-16 2:05 ` nobu
1 sibling, 0 replies; 2+ messages in thread
From: nobu @ 2016-01-16 2:05 UTC (permalink / raw
To: ruby-core
Issue #11995 has been updated by Nobuyoshi Nakada.
Status changed from Open to Rejected
The latter is parsed as `-(0.5**0.2)`.
~~~
$ ruby -e 'p (-0.5)**0.2'
(0.7042902001692478+0.5116967824803669i)
~~~
`Float#**` can result an imaginary number, but `BigDecimal` is only for real numbers.
----------------------------------------
Bug #11995: BigDecimal#power fails for some values
https://bugs.ruby-lang.org/issues/11995#change-56117
* Author: Evgeniy Dolzhenko
* Status: Rejected
* Priority: Normal
* Assignee:
* ruby -v: ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
$ irb -rbigdecimal
> BigDecimal('-0.5').power(BigDecimal('0.2'))
Math::DomainError: Zero or negative argument for log
but
> -0.5**0.2
=> -0.8705505632961241
The same is true for a few other exponent version I have tested. Is that feature or bug?
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 2+ messages in thread
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2016-01-15 15:19 ` [ruby-core:72879] [Ruby trunk - Bug #11995] [Open] BigDecimal#power fails for some values dolzenko
2016-01-16 2:05 ` [ruby-core:72884] [Ruby trunk - Bug #11995] [Rejected] " nobu
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