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Bug #3270

closed

BigMath.exp が絶対値が大きな引数で遅い

Added by mrkn (Kenta Murata) over 14 years ago. Updated about 7 years ago.

Status:
Closed
Assignee:
mrkn (Kenta Murata)
Target version:
2.6
ruby -v:
ruby 1.9.3dev (2010-05-11 trunk 27729) [x86_64-darwin10.3.0]
Backport:
2.3: UNKNOWN, 2.4: UNKNOWN

Description

=begin
Rubyについて Part 40
http://pc12.2ch.net/test/read.cgi/tech/1272248179/121-122

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）
=end

Related issues 2 (0 open — 2 closed)

Related to Ruby master - Bug #3267: BigDecimal/mathでatan()に1.08を入れると戻り値の有効桁数が足りないClosedmrkn (Kenta Murata)05/11/2010Actions
Related to Ruby master - Bug #3271: BigMath.power が遅いClosedmrkn (Kenta Murata)05/11/2010Actions
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 #1

Updated by mrkn (Kenta Murata) over 14 years ago

  • Status changed from Open to Assigned

=begin

=end

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 #2

Updated by mrkn (Kenta Murata) over 14 years ago

  • Category set to lib

=begin

=end

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 #3 [ruby-core:37525]

Updated by nahi (Hiroshi Nakamura) over 13 years ago

  • Target version changed from 2.0.0 to 1.9.3
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 #4 [ruby-core:37949]

Updated by mrkn (Kenta Murata) over 13 years ago

  • Target version changed from 1.9.3 to 2.0.0
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 #5 [ruby-core:52359]

Updated by mrkn (Kenta Murata) almost 12 years ago

  • Target version changed from 2.0.0 to 2.6
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 #6 [ruby-core:83988]

Updated by mrkn (Kenta Murata) about 7 years ago

  • Status changed from Assigned to Closed
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