If hashes cannot be order I have to change the data structure. My previous example was however quite bad - it's not a simple ordering by Score. I want to order by top Score per ID (BLA, TRA) and then order by score for particular IDs score, grouping them together. Below is a bit better example. Apologies for confusing you and thanks for help;

my @entry;

push @entry, { 
    ID                 => 'BLA',
    Score             => 5,
    Location         => '1-10',
};

push @entry, { 
    ID                 => 'TRA',
    Score             => 15,
    Location         => '7-15',
};

push @entry, { 
    ID                 => 'BLA',
    Score             => 10,
    Location         => '2-10',
};

push @entry, { 
    ID                 => 'BLA',
    Score             => 35,
    Location         => '90-150',
};


Output; 

BLA 35 90-150
BLA 10 2-10
BLA 5, 1-10
TRA 15 7-15
[download]

 

@sorted = sort {
                                  $a->{ID} cmp $b->{ID} # alphanum asc
                                      or 
                                    $b->{Score} <=> $a->{Score} # num.
+ desc
                                  } @entry
[download]

See sort !

Cheers Rolf

(addicted to the Perl Programming Language)