I see thanks for that. I have a list of IDs with a corresponding score and location values. I want to order the IDs based on highest score associated with them. I also want the IDs to be grouped together. When I use array of hashes like below how would I order it then?

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',
};

Output; 

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

That's a completely different data structure now!!!

 @sorted = sort { $a->{Score} <=> $b->{Score} } @entry

Does it.

Cheers Rolf

(addicted to the Perl Programming Language)

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]