in reply to Finding hash key related to closest value
Assuming that performance is not your main concern and that your data really is bell-shaped (in particular increasing up to the max, and then decreasing), the following should do the trick:
my $max = max values %hash; my $half = $max/2; my @above = grep { $hash{$_} >= $half } keys %hash; my $keylo = min @above; my $keyhi = max @above; print "1: $max\n"; print "2: $half\n"; print "3: $keylo, $keyhi\n";
If you need the closest, you might want to check the neighbors of $keylo and $keyhi as well.
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