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To: FreeBSD-users-jp@jp.FreeBSD.org
Cc: tomoaki@nibb.ac.jp
From: Tomoaki NISHIYAMA <tomoaki@nibb.ac.jp>
In-Reply-To: <200206210334.MAA26841@pon.nintendo.co.jp>
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[FreeBSD-users-jp 69463]
shirai> $B!!$7$i$$$G$9!#(B

shirai> $B!!2?$r$7$F!V%i%s%@%`@-!W$H$9$k$+$O=t@b$"$k$H;W$$$^$9$,!"$3$3(B
shirai> $B$G;d$,I>2A$7$?$+$C$?$N$O!"!V%5%$%3%m$NL\$,$I$l$bF1$8?t$@$1=P(B
shirai> $B$k!W@-<A$r$I$l$@$1K~$?$9$+$G$9!#(B

$B!V%5%$%3%m$NL\$,$I$l$bF1$8?t$@$1=P$k!W$N$O%i%s%@%`$G$O(B
$B$J$$$G$7$g$&!#(B
256$BLLBN$N%5%$%3%m$r(B256$B2s$U$C$?$i(B1-256$B$,(B1$B2s$:$D=P$k$N$O(B
$B6vA3$G$O$[$H$s$I$"$jF@$J$$$3$H$G$7$g!#(B

shirai> > $B$H$$$&$3$H$G!"(Blrand48()$B$,M%=($H$O8@$$$,$?$$$H$*$b$$$^$9!#(B
shirai> > $B$@$$$?$$(B2^n$B$rK!$H$9$k@~7A9gF1K!$O4pK\E*$KNI$/$J$5$=$&$J$N$G(B
shirai> > random()$B$r;H$&$N$,$*<j7ZMQES$K$O$$$$$N$G$O$J$$$G$7$g$&$+!#(B
shirai> 
shirai> $B!!(BPOSIX $B$N2r@b$rNI$/FI$`$H!"3N$+$K(B random(3) $B$h$j(B lrand48(3)
shirai> $B$N;HMQ$r?d>)$7$F$$$k$b$N$N!"$=$NM}M3$O!V%^%k%A%9%l%C%I$G$bFH(B
shirai> $BN)$7$?Mp?tNs$,F@$i$l$k!W$H$J$C$F$$$^$7$?!#(B
shirai> $B!!$H$$$&$3$H$O!"(Blrand48(3) $B$NM%0L@-$OIaDL$N4D6-$G$OH/4x=PMh(B
shirai> $B$J$$$H$$$&$3$H$J$s$G$7$g$&$+!)(Bsource $B$r8+$F$b(B random(3) $B$h$j(B
shirai> $B$OJ#;($J7W;;$r$7$F$$$F!"C1BN$G$b==J,$h$jIJ<A$NNI$$Mp?t$r@8@.(B
shirai> $B$7$=$&$J5$$O$9$k$N$G$9$,!#(B
shirai> $B!!L^O@!"7W;;NL$NB?$5$d7W;;<0$NJ#;($5$,Mp?t$NIJ<A$KD>7k$9$kLu(B
shirai> $B$G$O$"$j$^$;$s$,!"$"$l$@$1M>7W$K;~4V$r$+$1$F@8@.$7$?Mp?t$,!"(B
shirai> $B$h$jIJ<A$N0-$$$b$N$@$H$O;W$$$?$/$"$j$^$;$s$M!#(B

source$B$OJ#;($K8+$($k$+$b$7$l$^$;$s$,!"$=$l$O$*$=$i$/B?G\D91i;;(B
$B$r=q$$$F$"$k$+$i$G!"<B:]$N7W;;<0$O(Bman rand48(3)$B$r$_$k$H(B
 r(n+1) = (a * r(n) + c) mod m where the
 default values are for the multiplicand a = 0xfdeece66d = 25214903917 and
 the addend c = 0xb = 11.  The modulo is always fixed at m = 2 ** 48.
$B$G$"$k;]$,5-$5$l$F$*$j$^$9!#(B
$B<~4|$O$*$=$i$/(B2^48$B$G$7$g$&$+$i!"A4<~4|$K$D$$$F$O(B
$B<~4|$,Ls(B16*((2**31)-1)$B$G$"$k(B(man random(3)) random()$B$h$j$bM%$l$F$$$k$N$G$7$g$&!#(B

$B$?$@$7!"(Brandom()$B$O(Binitstate()$B$G(B8$B$+$i(B256bytes$B$N>uBV(Bbuffer$B$NBg$-$5$r(B
$B;XDj$G$-$F(B256 bytes$B$K$9$l$P!"(B2^69$B$N<~4|$K$J$k$H=q$+$l$F$*$j$^$9!#(B
$B$?$V$s%G%U%)%k%H$h$jCY$/$J$k$N$G$7$g$&!#(B

$B$^$?!"(Brand48()$B$O(B48bit$BCM$N2<(B17bit$B$r<N$F$F$$$k$@$1$J$N$G!":G2<0L(Bbit$B$O(B
2^18$BDxEY$N<~4|@-$r;}$D$3$H$G$7$g$&!#(B ($BMp?t$r(B2^18$B8D$H$C$F:G2<0L(Bbit$B$r5-O?(B
$B$7$F!"<!$N(B2^18$B8D$r$_$k$H$-$C$HF1$8=gHV$G(B0$B$H(B1$B$,8=$l$k$O$:!#(B)$B2<0L(B8bit$B$@$H(B 
2^26 = 67108864$B8D$G0l<~$9$k$O$:$G$9$+$i!"(B1000$BK|$N$+$o$j$K(B6710$BK|(B8864$B$G@h(B
$B$NE}7W$r<h$C$?$iJ,$+$k$N$G$O$J$$$G$7$g$&$+!#(B($B?tIC$,?t==IC$K$J$k$@$1$G$7$g(B
$B$&$+$i!K!#(B%256$B$7$?CM$r8+$k$J$i!"(Brand()$B$N2<0L(B17bit$B$r<N$F$F$b$[$\F1$85sF0(B
$B$K$J$k$O$:$G$9!#(B

shirai> $B!!K\Ev$K%]%"%=%sJ,I[$K=>$&Mp?t$,NI$$Mp?t$J$s$G$9$+!)(B

$B%]%"%=%sJ,I[$K=>$&$+$iNI$$$H$O8B$j$^$;$s$,!"(B
$BNI$$Mp?t$J$i%]%"%=%sJ,I[$K=>$&$Y$-$G$7$g$&!#(B
$B%]%"%=%sJ,I[$K=>$o$J$$Mp?t$O0-$$Mp?t$G$9!#(B

shirai> > simulation$B$J$I$N8&5fMQ$K$O%7%9%F%`ImB0$N$r;H$o$J$$$G!"(B
shirai> > MT$B$[$+2?<oN`$+$r;n$9$N$,K>$^$7$$$G$7$g$&!#(B
shirai> 
shirai> $B!!$=$l$r(B QandA $B$K=q$-$^$9!)$=$&$J$k$H4{$K!V(BFreeBSD QandA$B!W$G(B
shirai> $B$O$J$/$J$C$F$7$^$&$h$&$J5$$,$9$k$s$G$9$,!#(B

$B6qBNNc$O$D$1$J$/$H$b!"%7%9%F%`30$N$b$N$r;H$&<j$,(B
$B$"$k$3$H$r<(:6$7$F$*$/$/$i$$$O$7$?J}$,$$$$$H;W$$$^$9!#(B
-- 
Tomoaki Nishiyama
  e-mail:tomoaki@nibb.ac.jp
National Institute for Basic Biology
