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<p>perl -e 'my ($len,$total)=(0,0);my @x;while(<>){if(/^[\>\@]/){if($len>0){$total+=$len;push@x,$len;};$len=0;}else{s/\s//g;$len+=length($_);}}if ($len>0){$total+=$len;push @x,$len;}@x=sort{$b<=>$a}@x; my ($count,$half)=(0,0);for (my $j=0;$j<@x;$j++){$count+=$x[$j];if(($count>=$total/2)&&($half==0)){print "N50: $x[$j]\n";$half=$x[$j]}elsif($count>=$total*0.9){print "N90: $x[$j]\n";exit;}}' contigs.fahttp://seqanswers.com/forums/showthread.php?t=2766</p>
<p>[[N50 N90 calculation using Perl code]] </p>
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<p><a href="http://seqanswers.com/forums/showthread.php?t=2766">http://seqanswers.com/forums/showthread.php?t=2766</a></p>
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