Forum: Ruby-core [ruby-trunk - Bug #3270] BigMath.exp が絶対値が大きな引数で遅い

7cca11c5257fda526eeb4b1ada28f904?d=identicon&s=25 mrkn (Kenta Murata) (Guest)
on 2013-02-17 07:41
(Received via mailing list)
Issue #3270 has been updated by mrkn (Kenta Murata).

Target version changed from 2.0.0 to next minor

Bug #3270: BigMath.exp が絶対値が大きな引数で遅い

Author: mrkn (Kenta Murata)
Status: Assigned
Priority: Normal
Assignee: mrkn (Kenta Murata)
Category: lib
Target version: next minor
ruby -v: ruby 1.9.3dev (2010-05-11 trunk 27729) [x86_64-darwin10.3.0]

 Rubyについて Part 40
 > あと、expの絶対値が大きくなると、戻って来ないのよね。
 > exp(a*b+c) = exp(a)**b * exp(c)
 > を使うと、幸せになれるかも。(ん十倍の威力で)
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