This is not my exact script, but I wrote it in a similar format. Trying to create an array of arrays in one subroutine, and then returning it as a variable, to be used later in a second subroutine. When I test by printing indices from the arrays in the array of arrays, however, it does not seem to work (it says, for instance, "Use of uninitialized value $array1[0] in concatenation (.) or string"]. 

my @array1;
my @array2;
my @array3;
my @array_array;

@array_array = @{ &firstRoutine() };
&secondRoutine(\@array_array );

sub firstRoutine{

        my $count = 0;
        while (<INPUT>){
                my @line =  split( /\s+/, $_ );

                $array1[$count] = $line[0];
                $array2[$count] = $line[1];
                $array3[$count] = $line[2];

                $count = $count + 1;
        }

        my @array_array;
        push( @array_array, @array1, @array2, @array3);
        return \@array_array;
}

sub secondRoutine {
    my (@array1, @array2, @array3) = { shift @_ };

        print ("Test first value in array1: $array1[0]");
        print ("Test third value in array2: $array2[2]");
        print ("Test fifth value in array3: $array3[4]");
}

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In reply to Array of arrays by SuzuBell

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