I used your suggestions to create the following script, which is still not quite right. It spits out all of the values in tab[0], whether or not they meet the criterion of the difference in $seed minus $tab[0] being greater than 0.1 I removed the use warnings and strict, just for the moment. 
#!/usr/bin/perl


open TAB, '<', 'test.txt' or die "Cannot open 'test.txt' $!";
<TAB>;
$seed = 1.04;
while (<TAB>){
    @tab = split ' ';
    $diff = $tab[0] - $seed;
    if ($diff >= 0.1) {print "@tab\n"; $seed eq $tab[0]} else {next};
}

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In reply to Re^2: Simple iteration problem by Anonymous Monk
in thread Simple iteration problem by Etbr77

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