From: "W. James" <w_a_x_man@...>
Date: 2009-12-18T17:30:15+09:00
Subject: Re: Math errors

jzakiya wrote:

> (-3)**3 => -27
> 
> (-27)**(1/3.0)  give NaN instead of -3
> 
> All odd roots (1/3,1/5,1/7 etc) of negative numbers should give
> negative root values, as above, but ruby (in irb) gives NaN (not a
> number), even when I require 'complex' .
> 
> Is this considered an error in Ruby?

irb(main):006:0> (-27)**(1/3.0)
=> NaN
irb(main):007:0> -27 ** (1/3.0)
=> -3.0

irb(main):012:0> RUBY_VERSION
=> "1.8.7"

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