perl応用:生物突然変異のランダムシミュレーションプログラム

use strict;
use warnings;


            #             
my $DNA="AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
";
my $i;
my $mutant;
srand(time|$$);
$mutant=mutate($DNA);
print "Mutate 
". $DNA;
print "Here is the original DNA:
";
print "$DNA
";
print "Here is the mutant DNA:

";
print "$mutant
";
print "Here are 10 more successive mutations:
";
for ($i=0;$i<10;++$i)
{
	$mutant=mutate($mutant);
	print "$mutant
";
}


            #   ：                   
sub randomposition
{
	my($string)=@_;
	return int(rand(length($string)));
}


            #   ：              
sub randelement
{
	my(@array)=@_;
	return $array[rand @array];
}


            #   ：        ， ATGC           
sub randomnucleotide
{
	my (@nucleotides)=qw/A T G C/;
	return randelement(@nucleotides);
}


            #   ：        
sub mutate
{
	my($dna)=@_;
	my(@nucleotides)=qw(A T G C);
	my($position)=randomposition($dna);
	my($newbase)=randomnucleotide(@nucleotides);
	substr($dna,$position,1,$newbase);#substr($string,$initial_position,$length,replacement substring)
	return $dna;
}




						

結果は次のとおりです.

F:\>perl\a.pl
Mutate
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
Here is the original DNA:
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

Here is the mutant DNA:

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAATAAAAAAAAAAAAAAA

Here are 10 more successive mutations:
ACAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAATAAAAAAAAAAAAAAA

ACAAAAAAAAACAAAAAAAAAAAAAAAAAAAAAAAAAAAAATAAAAAAAAAAAAAAA

ACAAAAAAAAACAAAAAAAAAAAAATAAAAAAAAAAAAAAATAAAAAAAAAAAAAAA

ACAAAAAAAAACAAAAAAAAAAAAATAAAAAAAAAAAAAAATAAAAAAAAAAAAAAA

ACAAAAAAAAACAAAAAAAAAAAAATAAAAAAAAAAAAAAATAAAAAAAAAAAAAAA

ACAAAAAAAAACAAAAAAAAAAAAATAAAAAAAAAAAAAAATGAAAAAAAAAAAAAA

ACTAAAAAAAACAAAAAAAAAAAAATAAAAAAAAAAAAAAATGAAAAAAAAAAAAAA

ACTAAAAAAAACAAAAAAAAAAAAATAAGAAAAAAAAAAAATGAAAAAAAAAAAAAA

ACTAAAAAAAACAAAAAAAAAAAAATAAGAAAAAAAAAAAATGTAAAAAAAAAAAAA

ACTAAAAAAAACAAAAAAAAAAAAATAAGAAAAAAAAAAAATGTAAAAAAAAAAAAA


F:\>