[Bug #781] Numeric#step $B$G(B step $B$H$7$F(B Infinity $B$r$D$+$&$H(B NaN $B$r@8@.$9$k$3$H$

Ruby Development
1

e$B%A%1%C%He(B #781 e$B$,99?7$5$l$^$7$?!#e(B (by tadayoshi funaba)

e$BC1$K3NG’$G$9$,!“e(Bstep
e$B$,IbF0>.?tE@?t$@$H!”:G=i$+$iIbF0>.?tE@?t$K$J$Ce(B
e$B$F$$$F!"B>$N>l9g$H0c$&$h$&$K8+$($^$9!#$3$l$O$3$&$$$&$b$N$G$9$+!#e(B

$ ./ruby -e “p 0.step(3,1.0){|x| p [x, x.class]}”
[0.0, Float]
[1.0, Float]
[2.0, Float]
[3.0, Float]
0

$ ./ruby -e “p 0.step(3,Rational(1)){|x| p [x, x.class]}”
[0, Fixnum]
[(1/1), Rational]
[(2/1), Rational]
[(3/1), Rational]
0

$ ./ruby -rbigdecimal -e “p 0.step(3,BigDecimal(‘1’)){|x| p [x,
x.class]}”
[0, Fixnum]
[#BigDecimal:81b5d48,‘0.1E1’,4(12), BigDecimal]
[#BigDecimal:81b5bcc,‘0.2E1’,4(12), BigDecimal]
[#BigDecimal:81b5adc,‘0.3E1’,4(12), BigDecimal]
0

http://redmine.ruby-lang.org/issues/show/781

2

e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B

In message “Re: [ruby-dev:37188] [Bug #781] Numeric#step e$B$Ge(B step
e$B$H$7$Fe(B Infinity e$B$r$D$+$&$He(B NaN
e$B$r@8@.$9$k$3$H$,$”$ke(B"
on Tue, 25 Nov 2008 23:39:19 +0900, tadayoshi funaba
[email protected] writes:

|e$BC1$K3NG’$G$9$,!“e(Bstep e$B$,IbF0>.?tE@?t$@$H!”:G=i$+$iIbF0>.?tE@?t$K$J$Ce(B
|e$B$F$$$F!"B>$N>l9g$H0c$&$h$&$K8+$($^$9!#$3$l$O$3$&$$$&$b$N$G$9$+!#e(B

beg, end,
stepe$B$N$$$:$l$+$,e(BFloate$B$@$H$<$s$Ve(BFloate$B$G7W;;$7$^$9!#e(B
e$B$3$l$O$=$&$$$&$b$N$N$D$b$j$G$9!#e(B