log_norm.pl
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#!/usr/bin/perl
use strict;
open(FL, "log_scores.txt");
my @logScores = <FL>;
chomp @logScores;
close FL;
my $total = 0.0;
$total = lnXpluslnY($logScores[0], $logScores[1]);
for(my $i=2;$i<@logScores;$i++) {
$total = lnXpluslnY($total, $logScores[$i]);
}
for(my $i=0;$i<@logScores;$i++) {
my $percent = exp($logScores[$i] - $total)*100.0;
print "Total score $total\n";
print "Log score $logScores[$i] is $percent % of total score\n";
}
sub lnXpluslnY {
my ($first, $second) = @_;
my $MAXEXP = -310;
my $x = $first;
my $y = $second;
my $temp;
my $ln_yMINUSln_x;
my $plus;
if ($y > $x) {
$temp = $x;
$x = $y;
$y = $temp;
}
$ln_yMINUSln_x = $y - $x;
if ($ln_yMINUSln_x < $MAXEXP) {
$plus = $x;
}
else {
$plus = log(1 + exp($ln_yMINUSln_x)) + $x;
}
return $plus;
}