From: Yusuke ENDOH <mame@...>
Date: 2009-11-01T14:13:53+09:00
Subject: [ruby-core:26466] Re: [Bug #2189] Math.atanh(1) & Math.atanh(-1) 	should not raise an error

Hi,

2009/11/1 Marc-Andre Lafortune <redmine@ruby-lang.org>:
> A mechanism could be implemented with a thread local option, say Math.raise_on_pole = true/false, or even hook, say for example:
> Math.on_pole=lambda{|object, operator, arguments, result| ... }

How about Math.log_with_pole_check()?


> Quote from SUSv3: A "pole error" occurs if the mathematical result of the function is an exact infinity (for example, log(0.0)).
> Since it is possible to return this "exact mathematical result", I strongly believe that Ruby should return the right Infinity.

+1

Just my 2 cents,

-- 
Yusuke ENDOH <mame@tsg.ne.jp>