How about this: 
use strict;
use warnings;

chomp (my @keys =  split /, /, <DATA>); # First row
shift @keys; # Drop "NAME"
my %h;
for (<DATA>){
    chomp ;
    my ($name,@items) =  split /,\s*/ or next;
    $h{$name} = { map {$keys[$_] => $items[$_] =~/(\d+)/ } 0..$#keys }
+;
}

printcol("IN",{row1=>["a","c"], row2=>["d","b"]});
printcol("OUT",{row1=>["a","c"], row2=>["d","b"]});

sub printcol{
    my ($col, $r) = @_;
    print "$col:\n";
    for (sort keys %$r){
       print "$_ : ",join (", ", map{ $h{$_}{$col} } @{$r->{$_}}), "\n
+";
    }
    print "\n$col:\n";    
    for (sort keys %$r){
       print "$_ : ",join (", ",  @{$r->{$_}}), "\n";
    } 
    print "\n";
}

__DATA__
NAME, IN, OUT
a, 10, 20 
b, 10, 30  
c, 50, 20
d, 20, 60

[download]
Output: 
IN:
row1 : 10, 50
row2 : 20, 10

IN:
row1 : a, c
row2 : d, b

OUT:
row1 : 20, 20
row2 : 60, 30

OUT:
row1 : a, c
row2 : d, b

[download]

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In reply to Re: Linking data together by NetWallah
in thread Linking data together by perlUser345

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