Numeric#scalar?

e$B$"$i$?$a$FH?O@$J$I$J$1$l$P!"?tF|Cf$Ke(B scalar? e$B$+$ie(B real?
e$B$KJQ99$7$F$7$^e(B
e$B$*$&$+$H;W$$$^$9!#e(B

e$B:XF#$H?=$7$^$9!#e(B

On Mon, 8 Sep 2008 20:35:34 +0900
“Shugo M.” [email protected] wrote:

e$B@53N$K$O86$5$s$,!V$“$j$($k$N$G$O$J$$$+!W$H;W$C$F$$$kLdBj$H$O0c$$$^$9$h$M!#e(B
e$B86$5$s$,7|G0$7$F$$$k$N$O!VHf3S$,$G$-$F$+$D<B?t$G$J$$?t!W%1!<%9$G$”$C$F!“e(B
e$B!VHf3S$,$G$-$J$/$F$+$D<B?t$G$”$k!W%1!<%9$G$O$J$$$N$G!#e(B

e$B$=$&$G$9$M!#e(B

e$B$h$/$o$+$i$J$+$C$?$N$G$9$,!“:XF#$5$s$N:n$i$l$F$$$k%/%i%9$G$Oe(Bcomparable?e$B$Oe(B
falsee$B$rJV$9$3$H$K$J$k$N$G$7$g$&$+e(B?
e$B$b$7!”$=$&$@$H$9$k$H!"$?$H$($Pe(Bxe$B$He(Bye$B$,$=$N%/%i%9$N%$%s%9%?%s%9$@$C$?$H$7$F!“e(BComplex(x, y)
e$B$,0J2<$N$h$&$J%(%i!<$K$J$k$H;W$&$N$G$9$,!”$=$l$O0U?^$5$l$?$3$H$G$7$g$&$+e(B?

irb(main):001:0> Complex(x, y)
ArgumentError: not a real

e$B<+J,$NCf$G$O!“e(Bx e$B$He(B y
e$B$,3F!9e(BFloate$B$HCx:n%/%i%9$G$J$1$l$P!”%(%i!<$K$J$i$J$$$Ge(B
e$BM_$7$$$G$9!#e(BFloat(e$B$H!“$=$l$r%a%s%P$H$7$FJ];}$9$ke(BComplexe$BEye(B)e$B$H$O:.$<$F7W;;$7$?$/e(B
e$B$J$$!”$H$$$&$3$H$G$9!#e(B

e$B!D!D$H$9$k$H!“K\Bj$+$i$O$=$l$^$9$,!”<+J,$N%/%i%9$G$Oe(BNumeric#real?e$B$r$I$&<BAu$7$?$ie(B
e$B$$$$$N$G$7$g$&$+e(B?

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e$BL>A0$H$7$F$Oe(Breal?e$B$NJ}$,$h$jE,@Z$@$C$?$j$7$J$$$G$7$g$&$+!#e(B

e$B@5D>!“<+J,$G$b:#$N5DO@$,M}2r$7$-$l$F$$$J$$5$$,$7$F$-$^$7$?!#$H$j$”$($:!“e(Breal?e$B$He(B
e$B$$$&L>A0$KH?BP$N0U;V$O!”:#$"$j$^$;$s!#e(B

On Mon, 8 Sep 2008 21:15:14 +0900
“Yugui (Yuki S.)” [email protected] wrote:

e$B$H$j$“$($:!“e(Bscalar?e$B$re(Breal?e$B$K$7$F!”$=$N8e$Ke(Bexact?/inexact?e$B$r8!F$$9$k$N$,e(B
e$BNI$$$N$G$O$J$$$G$7$g$&$+!#e(Bcomparable?e$B$+$I$&$+$Oe(Bscalar?e$B@-$He(Bexact?e$B@-$K=>$Ce(B
e$B$F%”%W%j%1!<%7%g%s!&%I%a%$%s$N@-<A$K1~$8$FDj$^$k$3$H$G$9!#e(B

e$B<+J,$Oe(Bexact/inexacte$B$K$D$$$F$NM}2r$,$[$\3’L5$G$9$N$G!“e(Byuguie$B$5$s$N>e5-J8LL$r85$Ke(B
e$BJY6/$7$^$9!”$H$$$&$H$3$^$G$7$+8@$($^$;$s!#e(B(e$B$4$a$s$J$5$$!#e(B)

e$B$7$+$7$*$=$i$/!“$=$l$,<+J,$NM_$9$k$H$3$m$G$”$m$&!"$H$$$&5$$,$7$F$$$^$9!#e(B

e$B$H$3$m$G!“e(BPrecisione$B$O$I$&$J$C$F$k$s$G$7$g$&!#%i%$%V%i%j$N<BAu$r8+$k$K$Oe(B
e$B$”$^$j?tCM%*%V%8%'%/%H$N1i;;$K9W8%$7$F$$$k$h$&$K;W$($^$;$s$,!#e(B

e$B<+:n$N%/%i%9$G$O!“4{B8e(BNumerice$B$H$N?FOB@-$r9M$($F@_7W$7$F$$$?$N$GEvA3!“e(BPrecision
e$B<~$j$N<BAu$b$7$h$&$H:G=i$O;W$C$F$$$^$7$?!#$,!”:n<T$4K?M$,$k$S$^$G!V1xE@!We(B
e$B!V;H$$F;$,$J$$!W$H$*$C$7$c$C$F$k$N$G!”$3$l$+$i:n$k%b%@%s$J%W%m%@%/%H$H$7$F$O!"e(B
e$B<BAu$r>J$/$3$H$K$7$^$7$?!#e(B

http://jp.rubyist.net/magazine/?0011-Hotlinks#l17

e$B:XF#$H?=$7$^$9!#e(B

On Tue, 16 Sep 2008 21:38:30 +0900
“Shugo M.” [email protected] wrote:

e$B!D!D$H$9$k$H!“K\Bj$+$i$O$=$l$^$9$,!”<+J,$N%/%i%9$G$Oe(BNumeric#real?e$B$r$I$&<BAu$7$?$ie(B
e$B$$$$$N$G$7$g$&$+e(B?

Complex()e$B$N;~E@$G$=$&$$$&%A%'%C%/$r$9$k$N$Oe(B(e$B>/$J$/$H$b:#$NOHAH$G$Oe(B)e$BL5M}$@$He(B
e$B;W$&$N$G!"e(Breal?e$B$Oe(Btruee$B$rJV$9$N$,$h$$$N$G$O$J$$$G$7$g$&$+!#e(B

truee$B$rJV$5$J$$$H!"e(BFloate$B$,2p:_$7$J$$7W;;$G$b4|BTDL$j$KF0$+$J$/$J$C$F$7$^$&e(B

e$B$N$G!#e(B

e$B$J$k$[$I!“$=$l$OLdBj$J$N$G!“e(Breal?
#=>truee$B!”$G<BAu$9$k$3$H$K$7$^$9!#e(B
e$B$”$j$,$H$&$4$6$$$^$9!#e(B

e$BNc30$,5s$,$k$N$O!":XF#$5$s$N%/%i%9$N%$%s%9%?%s%9$He(BFloate$B%$%s%9%?%s%9$H$N4V$Ge(B
e$B<B:]$K1i;;$,9T$o$l$k;~$^$GCY1d$5$l$k$3$H$K$J$k$H;W$$$^$9!#e(B

e$B$3$l$G$bLdBj$J$5$=$&$G$9!#e(B

e$BA0ED$G$9!#e(B

2008/09/16 18:58 Tadashi S. [email protected]:

e$B$J$$!"$H$$$&$3$H$G$9!#e(B

e$B!D!D$H$9$k$H!“K\Bj$+$i$O$=$l$^$9$,!”<+J,$N%/%i%9$G$Oe(BNumeric#real?e$B$r$I$&<BAu$7$?$ie(B
e$B$$$$$N$G$7$g$&$+e(B?

Complex()e$B$N;~E@$G$=$&$$$&%A%'%C%/$r$9$k$N$Oe(B(e$B>/$J$/$H$b:#$NOHAH$G$Oe(B)e$BL5M}$@$He(B
e$B;W$&$N$G!"e(Breal?e$B$Oe(Btruee$B$rJV$9$N$,$h$$$N$G$O$J$$$G$7$g$&$+!#e(B

truee$B$rJV$5$J$$$H!"e(BFloate$B$,2p:_$7$J$$7W;;$G$b4|BTDL$j$KF0$+$J$/$J$C$F$7$^$&e(B

e$B$N$G!#e(B

e$BNc30$,5s$,$k$N$O!":XF#$5$s$N%/%i%9$N%$%s%9%?%s%9$He(BFloate$B%$%s%9%?%s%9$H$N4V$Ge(B
e$B<B:]$K1i;;$,9T$o$l$k;~$^$GCY1d$5$l$k$3$H$K$J$k$H;W$$$^$9!#e(B