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# MZT random number generator # # distribution: uniform # use r_univ() to get number from 0.0 to 1.0 package r_univ; use strict; use warnings; use Exporter; our @ISA=qw/Exporter/; our @EXPORT=qw/r_univ/; my @uu; my ($cc,$cd,$cm)=(362436.0/16777216.0, 7654321.0/16777216.0, 16777213.0/16777216.0); my ($ip,$jp)=(97,33); sub r_univ_init_rep($$$$){ my ($wi,$wj,$wk,$wl)=@_; my ($m,$t); foreach my $ii (0..96){ my ($s,$t)=(0,0.5); foreach my $jj (1..24){ $m=((($wi*$wj)%179)*$wk)%179; $wi=$wj; $wj=$wk; $wk=$m; $wl=(53*$wl+1)%169; $s+=$t if (($wl*$m)&63)>0x1f; $t*=0.5; $uu[$ii]=$s; } } } sub r_univ_init(){ srand(time()); my ($a,$b,$c,$d); do{ $a=1+rand()*178; $b=1+rand()*178; $c=1+rand()*178; $d=rand()*167; }while($a+$b+$c <= 3); r_univ_init_rep($a,$b,$c,$d); } sub r_univ(){ my $aux; $aux=$uu[$ip-1]-$uu[$jp-1]; ++$aux if($aux<0.0); $uu[$ip-1]=$aux; --$ip; $ip=97 unless $ip; --$jp; $jp=97 unless $jp; $cc-=$cd; $cc+=$cm if $cc<0.0; $aux-=$cc; ++$aux if $aux<0.0; return $aux; } r_univ_init(); 1;

In reply to MZT random number generator by js29a

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