I have 5 arrays I would like to compare but would like to do it a pair at a time. I initially had gotten help by seeing if I can have a variable in an array. My arrays were: @array1, @array2, @array3, @array4. I am able to compare 2 at a time manually with: 
use strict;
use warnings;

@array1 = (c,d,e);
@array2 = (e,f,g,h);
@array3 = (a,b,d);
@array4 = (s,g,h,j,k,l)
my (%union, %intersect);
foreach my $e (@array1, @array2) {
    $union{$e}++ && $intersect{$e}++
}
my @intersect = sort keys %intersect;
print FILEOUT "@intersect\n"; #prints intersecting words
print FILEOUT scalar @intersect;

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I thoutht I could change the array names to variable so that I can have the script run through all pairs. The idea was this; through a loop change the array name so that they could be compared. Name change would be done like this: foreach (1..4){@{"array$_"};} I started by testing it out like this: 
foreach(1..4) {
   my (%union, %intersect);
   foreach my $e (@title1, @{"title$_"}) {
      $union{$e}++ && $intersect{$e}++
    }
    my @intersect = sort keys %intersect;
    print FILEOUT "@intersect\n";
    print FILEOUT scalar @intersect;
    print FILEOUT "\n";
}

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It wasn't working. For some reason the comparison doesn't work and my results were four 0s. I thought it may have been where I declared the variables and moved it out of the loop but no luck. Wondering if anyone had any ideas or could help. My end result will be a table like this: 
       array1 : array2 : array3 : array4
array1: 10 : 5 : 17 : 2
array2: 5 : 15 : 8 : 1
array3: 17 : 8 : 14 : 6
array4: 2 : 1 : 6 : 19

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Thought I'd start with the comparison first and then format it. I think as I loop through it, I can control the layout. Thanks-

In reply to Array name with a Variable by godevars

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