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From: Tomoaki NISHIYAMA <tomoaki@nibb.ac.jp>
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[FreeBSD-users-jp 69474]
shirai> $B!!$7$i$$$G$9!#(B
shirai> 
shirai> $B!!$H$3$m$,!"(BN $B$rBg$-$/$7$F$$$/$H(B lrand48(3) $B$@$1$,%]%"%=%sJ,(B
shirai> $BI[$N4|BTCM$h$j$b>.$5$JI8=`JP:9CM$r=P$7;O$a$kLu$G$9!#$3$N$3$H(B
shirai> $B$O(B 1 $B2/2s$N;n9T;~$K1w$$$F82Cx$KI=$l$F$$$k$H;W$$$^$9!#(B
shirai> $B!!(B1000 $BK|2s$NCM$rNc<($7$?$N$O!"$3$N:90[$,I=$l$J$$DxEY$NJl=8(B
shirai> $BCD$r<($7$?$N$G$O0UL#$,L5$$$H;W$C$?$+$i$G!"$=$N7k2L(B lrand48(3)
shirai> $B$@$1$,%]%"%=%sJ,I[$K=>$o$J$$7k2L$H$J$C$F$7$^$$$^$7$?$,!"$3$l(B
shirai> $B$OMp?t$H$7$F$NIJ<A$,0-$$$3$H$r<($7$F$$$k$s$G$7$g$&$+!)(B

$B2<0L%S%C%H$[$I<~4|$,C;$$$N$O(B2^n$B$rK!$H$9$k@~7A9gF1K!$N=IL?$G$9$+$i!#(B
$B2<0L%S%C%H$r<h$j=P$9$h$&$J;H$$J}$r$9$k$N$,4V0c$C$F$$$k$H$b8@$($^$9!#(B

shirai> $B!!(BN $B$,==J,Bg$-$1$l$PI8=`JP:9$O(B 0 $B$K6a$E$$$F$$$/Lu$G!"0lHLO@(B
shirai> $B$H$7$F$=$N!V==J,Bg$-$$!W$H$$$&ogCM$,$I$NJU$j$K$"$k$N$+;d$K$O(B
shirai> $BH=CG=PMh$J$$$N$G$9$,!"$3$N(B lrand48(3) $B$N7k2L$K1w$$$F$O!V(BN $B$,(B
shirai> $B==J,$KBg$-$$!W$H;d$O;W$C$?$N$G$9$,!#(B

$B0lHLE*$JogCM$,$"$k$o$1$G$O$"$j$^$;$s$N$G2?$H$b8@$$$,$?$$$G$9!#(B
$B<h$j=P$92s?t$KHf$Y$F<~4|$,==J,$KD9$$I,MW$,$"$j$^$9!#(B
P. Hellekalek (1998)$B$G$O!"@8@.4o$N<~4|(BP$B$KBP$7$F!"(B
$B;H$&Mp?t$O(Bsqrt(P)$B8D$/$i$$$^$G$K$7$F$*$1$H$$$&$h$&$J$3$H$,(B
$B=q$+$l$F$$$^$9!#!JFC$K@~7A@8@.4o$N>l9g(B)

shirai> $B!!$=$l$H$b!"$3$l$O(B lrand48(3) $B$N<~4|$,B>$HHf$Y$FC;$$$?$a$K!"(B
shirai> N $B$,Bg$-$/$J$k$H(B rand(3) $B$N$h$&$JIT<+A3$J0lMMJ,I[$r<($7$F$7(B
shirai> $B$^$C$?7k2L$J$s$G$7$g$&$+!)(B

lrand48()$B$N2<0L(B8bit$B$@$C$?$i7W;;4V0c$$$G$J$1$l$P(B
6700$BK|0L$,<~4|$K$J$k$N$G!"(B1$B2/2s%5%s%W%j%s%0$9$k$H!"(B
$B0lMMJ,I[@.J,$r(B7$B3d$/$i$$B-$79~$`$3$H$K$J$k$G$7$g$&!#(B

shirai> $B!!$@$H$9$k$H!"(B256 $BLLBN%5%$%3%m$K1w$$$F!"$I$NL\$bKX$s$IF1$82s(B
shirai> $B?t$@$1=P$k$/$i$$$K!V==J,Bg$-$$!W;n9T2s?t$C$F$I$N$/$i$$$N$b$N(B
shirai> $B$K$J$k$s$G$7$g$&$+!)(B

$B??$NMp?t$G$O1J5W$K$J$j$^$;$s!#(B
[FreeBSD-users-jp 69477]$B$G(BHidetoshi Shimokawa$B$5$s$,2r@b$7$F$$$kDL$j!#(B

shirai> $B!!(Blrand48(3) $B$h$j5Q$C$FCY$/$J$C$F$7$^$$$^$7$?$M!#(B1 $BK|2s$+$i(B
shirai> 10 $BG\$:$D;n9T2s?t$rA}$d$7$F$$$C$?7k2L$r:\$;$^$9$,!"AG$N>l9g(B
shirai> $B$HHf$Y$FM-0U$JIJ<A8~>e$OG'$a$i$l$J$$$s$8$c$J$$$G$7$g$&$+!#(B

16*((2**31)-1) = 34$B2/$J$N$G!"(B30$B2/$H$+(B100$B2/2s$d$l$P(B
$B:9$,=P$k$3$H$G$7$g$&!#(B(counter$B$r(B 64bit$B$K$;$M$P!"!"!"(B)
1/3$B<~4|$N(B10$B2/$/$i$$$G$b0l1~:9$,=P$k$s$8$c$J$$$+$J!#(B

shirai> > $B6qBNNc$O$D$1$J$/$H$b!"%7%9%F%`30$N$b$N$r;H$&<j$,(B
shirai> > $B$"$k$3$H$r<(:6$7$F$*$/$/$i$$$O$7$?J}$,$$$$$H;W$$$^$9!#(B
shirai> 
shirai> $B!!5R4QE*$K$=$l$r<($9$3$H$O=PMh$^$9$+!):#$N$H$3$m(B MT $B$/$i$$$7(B
shirai> $B$+L>A0$,=P$F$-$F$$$J$$$N$G$9$,!"4:$($F$3$l0l$D$@$1<h$j>e$2$F(B
shirai> $B?d>)$9$kDx!"5R4QE*$K$bIJ<A$NNI$5$,G'$a$i$l$F$$$kMp?t$J$s$G$7(B
shirai> $B$g$&$+!)(B

P. Hellekalek (1998) $B$G$$$/$D$+$NMp?t@8@.4o$r>R2p!&8!F$$7$F$$$^$9!#(B
$B$=$NCf$G!"M#0l$9$Y$F$N%F%9%H$K%Q%9$7$?$N$,(Btwisted generalized feedback
shift-resister generators $B$N(BTT800$B$G!"$=$l$r$5$i$K2~NI$7$?$N$,(BMT
$B$G:#$N$H$3$mLdBjE@$,8+$D$+$C$F$$$J$$Mp?t@8@.4o$G$9!#(B

$BB.EYE*$K$b(Brand()$B$HBg:9$J$$$i$7$$$G$9(B(Sun$B$N>e$H$7$+=q$$$F$J$+$C$?!K!#(B
$B%7%U%H1i;;$O$"$C$F$b>h;;$d=|;;$,$J$$$?$a$+$b!#(B

Hellekalek, P. 1998. Good random number generators are (not so) easy to find.
Mathematics and Computers in Simulation 46:485-505
-- 
Tomoaki Nishiyama
  e-mail:tomoaki@nibb.ac.jp
National Institute for Basic Biology
