Complex(-4.0,0.0)**(Complex(1.0/2,0.0)) with mathn

Ruby Development
1

1.8 e$B$Ge(B mathn e$B$r;H$C$Fe(B -4 ** (1/2) e$B$re(B (Float e$B$Ge(B)
e$B7W;;$9$k$He(B
NaN e$B$K$J$k$s$G$9$,$=$&$$$&$b$N$G$7$g$&$+!#e(B

% ./ruby -rmathn -ve ‘p Complex(-4.0,0.0)**(Complex(1.0/2,0.0))’
ruby 1.8.7 (2008-05-07 patchlevel 5000) [i686-linux]
/home/akr/ruby/18/lib/ruby/1.8/rational.rb:442: warning: method
redefined; discarding old numerator
/home/akr/ruby/18/lib/ruby/1.8/rational.rb:449: warning: method
redefined; discarding old denominator
/home/akr/ruby/18/lib/ruby/1.8/rational.rb:470: warning: method
redefined; discarding old gcd
/home/akr/ruby/18/lib/ruby/1.8/rational.rb:489: warning: method
redefined; discarding old lcm
/home/akr/ruby/18/lib/ruby/1.8/mathn.rb:110: warning: discarding old /
/home/akr/ruby/18/lib/ruby/1.8/mathn.rb:114: warning: discarding old /
/home/akr/ruby/18/lib/ruby/1.8/mathn.rb:120: warning: method redefined;
discarding old inspect
/home/akr/ruby/18/lib/ruby/1.8/mathn.rb:233: warning: method redefined;
discarding old sqrt
NaN

mathn e$B$8$c$J$/$Fe(B complex e$B$J$ie(B NaN e$B$K$O$J$j$^$;$s!#e(B

% ./ruby -rcomplex -ve ‘p Complex(-4.0,0.0)**(Complex(1.0/2,0.0))’
ruby 1.8.7 (2008-05-07 patchlevel 5000) [i686-linux]
Complex(1.22460635382238e-16, 2.0)

2

e$B$1$$$8$e!w$$$7$D$+$G$9e(B.

In [ruby-dev :34622 ] the message: "[ruby-dev:34622]
Complex(-4.0,0.0)**(Complex(1.0/2,0.0)) with mathn ", on May/09
02:46(JST) Tanaka A. writes:

1.8 e$B$Ge(B mathn e$B$r;H$C$Fe(B -4 ** (1/2) e$B$re(B (Float e$B$Ge(B) e$B7W;;$9$k$He(B
NaN e$B$K$J$k$s$G$9$,$=$&$$$&$b$N$G$7$g$&$+!#e(B

e$B$$$(e(B. e$B$=$&$$$&$b$N$G$O$J$$$G$9e(B.

% ./ruby -rmathn -ve ‘p Complex(-4.0,0.0)**(Complex(1.0/2,0.0))’

% ./ruby -rcomplex -ve ‘p Complex(-4.0,0.0)**(Complex(1.0/2,0.0))’
ruby 1.8.7 (2008-05-07 patchlevel 5000) [i686-linux]
Complex(1.22460635382238e-16, 2.0)

mathne$B$r%m!<%I$7$F$$$k$He(B.

Complex(-4.0,0.0) # => -4.0

e$B$K$J$je(B, e$B$=$N$^$^e(B
Floate$B$H$7$Fe(B**e$B$r7W;;$9$k$3$H$,860x$G$9e(B.

e$B0JA0$Oe(B, complex.rb e$B$Ge(B {Fixnum,Bignum,Float}#**
e$B$r:FDj5A$7$F$$$?$N$Ge(B,
e$B$3$N$^$^$G$bF0:n$7$F$$$?$N$G$9$,e(B,
complex.rbe$B$G$N:FDj5A$r$d$a$?$H$-$Ke(B, mathn.rb
e$B$GBe$j$NBP1~$r$7$J$/$F$Oe(B
e$B$$$1$J$$$3$H$K5$$,IU$$$F$$$^$;$s$G$7$?e(B.

e$B$I$&$9$k$Y$-$+9M$($F$_$^$9e(B.

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