From: "K.Kodama" <kdm@...>
Date: 2000-04-19T12:48:13+09:00
Subject: [ruby-list:21986] Re: Polynomial.rb and floating point exception

児玉です. 自己res(訂正).

From: "K.Kodama" <kdm@kobe-kosen.ac.jp>
Subject: [ruby-list:21984] Re: Polynomial.rb and floating point exception
Date: Wed, 19 Apr 2000 09:20:37 +0900
Message-ID: <20000419092041J.kdm@kobe-kosen.ac.jp>
....
> def <=>(o)
>   if self===Inf;  if o===Inf; return 0;else return 1;end
>   elsif self===Infm;  if o===Infm; return 0;else return -1;end
>   end
> end

無限大の扱いですが,
上だと clone されちゃうとダメみたい.
以下のように変えて polynomial(number.rb) を更新しました.

def initialize(s); @sign=s;end
Inf=InfinityClass.new(1) # +Infinity
Infm=InfinityClass.new(-1) # -Infinity
undef initialize

def <=>(o)
  if o.kind_of?(InfinityClass); return @sign<=>o.sign;end
  return @sign<=>0
end

-- 
K.Kodama(kodama@kobe-kosen.ac.jp)