Update wrong answer. cog has it right.
use strict;
use warnings;
my %hash=(
1=> [1.5, 2.1, 3.1],
2=> [1.2, 2.2, 3.2],
3=> [1.3, 2.3, 3.3],
);
my @array = sort {$a<=> $b} map {@{$hash{$_}}} keys %hash;
print "@array";
Prints:
1.2 1.3 1.5 2.1 2.2 2.3 3.1 3.2 3.3
DWIM is Perl's answer to Gödel
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