From: dolzenko@...
Date: 2016-01-15T15:19:44+00:00
Subject: [ruby-core:72879] [Ruby trunk - Bug #11995] [Open] BigDecimal#power fails for some values

Issue #11995 has been reported by Evgeniy Dolzhenko.

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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
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$ 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?



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