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To: FreeBSD-users-jp@jp.FreeBSD.org
In-reply-to: Your message of Thu, 20 Jun 2002 17:22:57 JST.
             <20020620172257Z.tomoaki@koke.nibb.ac.jp>
Date: Fri, 21 Jun 2002 12:34:39 +0900
From: Takashi SHIRAI <shirai@nintendo.co.jp>
Reply-To: FreeBSD-users-jp@jp.FreeBSD.org
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X-Distribute: distribute version 2.1 (Alpha) patchlevel 24e+020611
X-Sequence: FreeBSD-users-jp 69463
Subject: [FreeBSD-users-jp 69463] Re: [info] Updated FreeBSD QandA
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Sender: owner-FreeBSD-users-jp@jp.FreeBSD.org
X-Originator: shirai@nintendo.co.jp

$B!!$7$i$$$G$9!#(B

In Message-Id <20020620172257Z.tomoaki@koke.nibb.ac.jp>
        Tomoaki NISHIYAMA <tomoaki@nibb.ac.jp>$B$5$s(Bwrites:
> $B$3$3$O9M$(J}$,JQ$G$9!"A0<T$O(B1/256$B$N3NN($G5/$-$k;v>]$r(B1000$BK|2s(B
> $B;n9T$7$?$H$-$K5/$-$k2s?t$N$P$i$D$-$r9M$($k$N$G$9$+$i!"(B
> 2$B9`J,I[$r9M$($k$N$G$9$,!"%]%"%=%sJ,I[$G6a;w$9$k$b$N$H$7$F!"(B
> $B$R$H$D$N?tJU$j$N=P8=?t$O(B1000 0000 / 256 = 39062.5$B$J$N$G(B
> sqrt(39062.5) = 197.6$BA08e$NI8=`JP:9$,=P$k$N$,%i%s%@%`@-$N(B
> $B9b$$Mp?t$G$9!#(B

$B!!2?$r$7$F!V%i%s%@%`@-!W$H$9$k$+$O=t@b$"$k$H;W$$$^$9$,!"$3$3(B
$B$G;d$,I>2A$7$?$+$C$?$N$O!"!V%5%$%3%m$NL\$,$I$l$bF1$8?t$@$1=P(B
$B$k!W@-<A$r$I$l$@$1K~$?$9$+$G$9!#(B
$B!!Nc$($P(B rand(3) $B$Oe:No$J<~4|@-$,$"$k$?$a$K!"(B256 $BLLBN$N%5%$(B
$B%3%m$r(B 256 $B2s?6$k$HA4$F$NL\$,Ey$7$/0l2s$:$D=P$^$9!#Mp?t$H$7(B
$B$F$N<A$O$H$b$+$/0lMM@-$N$_$K4X$7$F$OM}A[E*$G$"$k$H$b8@$($^$9!#(B
$B!!L^O@!"$3$l$@$1$rB*$($FMp?t$NIJ<A$r1>!9$9$k$N$OMpK=2a$.$^$9(B
$B$,!"0l$D$N;X?K$K$O$J$k$+$H;W$C$F7WB,$7$F$_$^$7$?!#(B

$B!!(BS[n] = { 256 $BLLBN%5%$%3%m$NL\(B n $B$,=P$?2s?t(B } $B$HDj5A$7$F!"(B
	M = $B&2(B(S[n]) / 256
	V = $B&2(B((S[n] - M)^2) / 256
	SD = $B"e(BV
$B$H$7$F5a$a$?CM$rNs5s$7$?$N$,$"$N?tCM$G$9!#(B
$B!!$3$N>l9g(B $B&2(B(S[n]) $B$OAm;n9T2s?t(B 1000 $BK|2s$J$N$G(B M = 39062.5
$B$K$J$j$^$9!#%]%"%=%sJ,I[$NFCD'$H$7$F(B V = M $B$J$N$G!"$b$7%]%"(B
$B%=%sJ,I[$K=>$&$J$i$P(B SD $B$N4|BTCM$O(B 197.6 $B$G$9$,!"(BS[n] $B$OK\Ev(B
$B$K%]%"%=%sJ,I[$J$s$G$7$g$&$+!)(B

$B!!$`$7$m!"K\Mh$OFHN);v>]$NH&$N$b$N$,!"Mp?tNs$H$$$&=>B0;v>]$K(B
$B$h$j<BAu$5$l$F$7$^$C$F$$$k$N$G!"%]%"%=%sJ,I[$K6a$$E}7WCM$,F@(B
$B$i$l$F$7$^$C$?$s$8$c$J$$$+$H;W$&$s$G$9$,!#(B


> $BF1MM$K8e<T$O!"(Bsqrt(1000 0000 / (256 * 256))=12.4$BA08e(B
> $B$,4|BT$5$l$k$O$:$G$9!#(B

$B!!$3$A$i$NJ}$O!V$"$k%5%$%3%m$NL\$N<!$K=P$k%5%$%3%m$NL\$,$I$l(B
$B$bF1$8?t$@$1=P$k!W@-<A$rI>2A$7$?7k2L$G$9!#(B
$B!!(BS[m][n] = { 256 $BLLBN%5%$%3%m$NL\(B n $B$,(B m $B$KB3$$$F=P$?2s?t(B }
$B$HDj5A$7$F!"(B
	M = $B&2(B(S[m][n]) / (256 * 256)
	V = $B&2(B((S[m][n] - M)^2) / (256 * 256)
	SD = $B"e(BV
$B$H$7$F5a$a$?CM$G$9!#(B


> $B$H$$$&$3$H$G!"(Blrand48()$B$,M%=($H$O8@$$$,$?$$$H$*$b$$$^$9!#(B
> $B$@$$$?$$(B2^n$B$rK!$H$9$k@~7A9gF1K!$O4pK\E*$KNI$/$J$5$=$&$J$N$G(B
> random()$B$r;H$&$N$,$*<j7ZMQES$K$O$$$$$N$G$O$J$$$G$7$g$&$+!#(B

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

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


> shirai> 	arc4random()$B2~(B:	199.112131	  12.384926
> $B$5$9$,$K$3$l$,0lHV@.@S$,$h$$$G$9$M!#%3%9%H$KFq$,$"$k$G$7$g$&$1$I!#(B

$B!!AG$N(B arc4random() $B$H$N:90[$O<B:]8m:9$NHO0OFb$G$9!#2?EY$+;n(B
$B9T$r7+$jJV$7$F$_$k$H!"AG$N$^$^$G$b(B 185-205 $B$NHO0OFb$N?tCM$r(B
$B=P$7$^$9!#(B
$B!!$=$N0lJ}$G%3%9%H$NLL$+$i$OLdBj$,$"$j2a$.$G$9$M!#B>$NMp?t$,(B
$B?tIC$G(B 1000 $BK|2s$N;n9T$r=*$($k$N$KBP$7!"$3$l$@$1$O(B 1 $B;~4V0J(B
$B>e$b$+$+$C$F$7$^$$$^$7$?!#(B

$B!t!!(BMMX-P5 266MHz $B$H$$$&Nt0-$J4D6-$,0-$$$H$$$&@b$b$"$k$1$I!#(B


> simulation$B$J$I$N8&5fMQ$K$O%7%9%F%`ImB0$N$r;H$o$J$$$G!"(B
> MT$B$[$+2?<oN`$+$r;n$9$N$,K>$^$7$$$G$7$g$&!#(B

$B!!$=$l$r(B QandA $B$K=q$-$^$9!)$=$&$J$k$H4{$K!V(BFreeBSD QandA$B!W$G(B
$B$O$J$/$J$C$F$7$^$&$h$&$J5$$,$9$k$s$G$9$,!#(B


> shirai>    $B$^$?!"7W;;NLEy$N>r7o$K$h$j!"H]1~L5$/IJ<A$N0-$$Mp?t$r;H$o$6$k(B
> shirai>    $B$rF@$J$$$h$&$J>l9g$K$O!"F@$i$l$?Mp?tCM$r:F2C9)$r;\$7$?>e$GMx(B
> shirai>    $BMQ$9$k$3$H$G!"$"$kDxEY$O<A$r>e$2$k$3$H$,=PMh$k$G$7$g$&!#(B
> shirai>    $B:F2C9)$NNc$H$7$F$O0J2<$N$h$&$J<jCJ$,$"$j$^$9!#(B
> $B:F2C9)$K$b%3%9%H$,$+$+$k$N$G!"IJ<A$K2fK}$G$-$J$$>l9g$O%7%9%F%`ImB0$G$J$$(B
> $B$b$N$r;H$&J}$,$$$$$G$9!#(B

$B!!$3$3$G$O$=$NA*Br;h$,F@$i$l$J$$>l9g$N5_:Q:v$r=q$$$?$D$b$j$J(B
$B$s$G$9$,!#?M$K$h$C$F>u67$OMM!9$J$N$G!">r7o$K$h$C$F$O(B rand(3)
$B$G$"$C$F$b;H$o$6$k$rF@$J$$%1!<%9$b$"$k$H;W$$$^$9!#(B
$B!!!VB>$NMp?t$r;H$(!W$H$$$&A*Br;h$O4{$K=R$Y$?8e$J$N$G!"$3$NIt(B
$BJ,$O$I$&$7$F$b$=$l$,=PMh$J$$>l9g$NJdB-$J$s$G$9!#$G$9$+$iFC$K(B
$B?d>)$7$F$$$kIw$K$OFI$a$J$$$h$&$J=q$-J}$K$7$?$s$G$9$,!#(B
$B!!$^$!!"M>7W$@$C$?$i$3$NItJ,$O(B QandA $B$+$i:o=|$7$F$7$^$C$F$b(B
$B$$$$$+$bCN$l$^$;$s$1$I$M!#(B

> $B$=$7$F!":G8e$K(B
> $B!V!Z;HMQ>e$NN10UE@![(B
>      $B@8@.$5$l$??t$N2<0L%S%C%H$O!"$"$^$j%i%s%@%`$G$O$J$$$N$G!"Cf0L(B
>      $B%S%C(B $B%H(B $B$r;HMQ$7$F$/$@$5$$!#$H$j$o$1!":G2<0L%S%C%H$O!"(B0 $B$H(B 1
>      $B$,8r8_$K8=$l$^$9!#!W(B
> $B$J$N$G!"3N<B$G$9!#(B

$B!!K!$r(B 2^11 $B$^$G>e$2$FD4$Y$^$7$?$,8+;v$K<~4|@-$,$"$j$^$9!#$"(B
$B$kMp?tCM$N<!$N?t$OI,$:F1$8Mp?tCM$K$J$j$^$9$7!"(B2^11 $B2s;n9T$9(B
$B$l$PI,$:(B 0$B!A(B2^11-1 $B$N?t$,0l2s$:$D8=$l$^$9!#(B
$B!!$=$l0J>e$NK!$K$9$k$H(B memory $BITB-$GE}7W$,<h$l$J$/$J$C$F$7$^(B
$B$C$?$N$GD4$Y$F$^$;$s$,!"5U$K(B rand(3) $B$N2<0L(B 12bits $B$r<N$F$?(B
$BCM$rMQ$$$FE}7W$r<h$k$H!"B>$NMp?t$HF1DxEY$N$A$i$P$j$r8+$;$k$h(B
$B$&$K$J$j$^$9!#<N$F$k(B bit $B?t$,$=$l0J2<$@$H$^$@<~4|@-$,;D$j$^(B
$B$9$M!#(B
$B!!B>$N:F2C9)$G$NJd@5$bD4$Y$F$_$k$H!"AG?t$G3d$k>l9g$O(B 101 $B0J(B
$B>e$NAG?t$@$HB>$NMp?tDxEY$N$P$i$D$-$K$J$j$^$7$?!#>jM>$r<h$k>l(B
$B9g$@$H(B 2053 $B0J>e$G$9$M!#(B
$B!!0lJ}!"6uBG$A$@$HA4$/BLL\$G$9!#6uBG$A2s?t$,Dj?t$N>l9g$OL^O@(B
$B$N$3$H!"6uBG$A2s?t$r99$KMp?t$G5a$a$F$_$F$bA4A3$P$i$D$-$^$;$s(B
$B$G$7$?!#!V<!$N%-!<F~NO$^$G6uBG$A!W$H$+$$$C$?ITFCDjMWAG$,I,MW(B
$B$K$J$k$G$7$g$&$M!#(B

                                               $B$7$i$$(B $B$?$+$7(B
