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In [ruby-dev:43840] the message: “[ruby-dev:43840] Re: [Ruby 1.9 -
Feature #4878][Open] CMath $B$K(B frexp, ldexp, hypot
$B$N(B3$B4X?t$OITMW$G$O$J(B
$B$$$+(B”, on Jun/17 15:37(JST) Yusuke ENDOH writes:
$B1sF#$G$9!#(B
def cbrt(z)
if z.real?
cbrt!(z)
else
Complex(z) ** (1.0/3)
end
end
$B$3$l$@$H(B, CMath.cbrt(-8) $B$H(B CMath.cbrt(Complex(-8,0))
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Complex(-8, 0).real? $B$,(B false $B$H$OA[Dj30$G$7$?!#(B
$B%a%=%C%IL>$,0-$+$C$?$+$J$!(B. $B$=$l$O$H$b$+$/(B,
CMath.cbrt(-8) == CMath.cbrt(Complex(-8,0))
$B$H$J$k(B, $B<+A3$J<BAu(B($B@5B’(B($BO"B3(B)$B$K$J$kJ#AG4X?t(B)$B$O(B
$B<gCM$r<h$k%a%=%C%I(B:
def cbrt(z)
Complex(z) ** (1.0/3)
end
$B0J30$J$$$N$G(B, $B$3$l$GG<F@$7$F$b$i$($^$9(B?
__
---------------------------------------------------->> $B@PDM(B $B7=<y(B
<<—
---------------------------------->> e-mail: [email protected] <<—
Kenta_M
23
Issue #4878 has been updated by Motohiro KOSAKI.
Status changed from Open to Rejected
提案者が提案を取り下げているようなのでrejectします
Feature #4878: CMath に frexp, ldexp, hypot の3関数は不要ではないか
Author: Kenta M.
Status: Rejected
Priority: Normal
Assignee: Yukihiro M.
Category:
Target version: 2.0.0
現在 CMath は、Math を include して各関数を再定義することで実装されています。
このやり方では、複素数向けの関数としては定義できない frexp, ldexp, hypot の3関数も同時に include
されてしまいます。
これらは Math の関数として定義されていれば良いだけですので、CMath からの削除を提案します。
$B1sF#$G$9!#(B
2011$BG/(B6$B7n(B17$BF|(B16:33 $B@PDM7=<y(B [email protected]:
CMath.cbrt(-8) == CMath.cbrt(Complex(-8,0))
$B$H$J$k(B, $B<+A3$J<BAu(B($B@5B’(B($BO"B3(B)$B$K$J$kJ#AG4X?t(B)$B$O(B
$B<gCM$r<h$k%a%=%C%I(B:
def cbrt(z)
Complex(z) ** (1.0/3)
end
$B0J30$J$$$N$G(B, $B$3$l$GG<F@$7$F$b$i$($^$9(B?
[ruby-dev:43842]
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