So, I'm trying to make a script that will assign input to a variable vector, print, and go to the next line and repeat. Go figure, I'm stuck. Any ideas? 
 #!/usr/bin/perl
use strict;
use warnings;
use diagnostics;
use Math::Vector::Real;

my $source = "./IN";

my $out = "./OUT";

open(IN, '<', $source) or die "Couldn't open $source: $!\n";
open(OUT, '>', $out) or die "Couldn't open $out: $!\n";

sub vector {
    my ($aa) = @_;
    $aa->[0] = my $one;
    $aa->[1] = my $two;
    $aa->[2] = my $three;
    my $vector = V($one, $two, $three);
}

my @data = map [ split ], grep /\S/, <IN>;

foreach my $d1 (@data) { print OUT " The vector of Atom ($d1->[0], $d1
+->[1], $d1->[2])is : %f\n", vector($d1); }

close IN;
close OUT;

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My Input file is: 

0 5 5
1 2 3
3 5 6
2 5 2
5 5 5
5 5 6

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And this is the error I get when I run it, 
mac95406:perl a7c$ ./perl
Use of uninitialized value in join or string at
    /Library/Perl/5.16/Math/Vector/Real.pm line 219, <IN> line 6 (#1)
    (W uninitialized) An undefined value was used as if it were alread
+y
    defined.  It was interpreted as a "" or a 0, but maybe it was a mi
+stake.
    To suppress this warning assign a defined value to your variables.
    
    To help you figure out what was undefined, perl will try to tell y
+ou
    the name of the variable (if any) that was undefined.  In some cas
+es
    it cannot do this, so it also tells you what operation you used th
+e
    undefined value in.  Note, however, that perl optimizes your progr
+am
    anid the operation displayed in the warning may not necessarily ap
+pear
    literally in your program.  For example, "that $foo" is usually
    optimized into "that " . $foo, and the warning will refer to the
    concatenation (.) operator, even though there is no . in
    your program.

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The line that the error directs me to is: 
 
sub as_string { "{" . join(", ", @{$_[0]}). "}" }

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Even knowing what that error means would be great for starters. Everything I see is declared and should have a value. I'm probably just blind though. Any help is appreciated.

In reply to How to vector by jcklasseter

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