Please tell me how I could have presented my question better/more clearly so that I can ensure I do so in future?

:) Yeah, I probably should not have lead with that comment, not that I remember , nor can I even guess what I was referring to. Your question is very well presented (practically perfect). Mea culpa.

Are you clear on the issue of the warning?

Here is another way with Perl6::Form ( also documented at http://search.cpan.org/dist/Perl6-Doc/share/Exegesis/E07.pod ) based on demo_columns

the more verbose version 

use Perl6::Form;
print form   {layout=>"across"},
'{:[{10}]:} {:[{10}]:} {:[{10}]:} {:[{10}]:} {:[{10}]:} {:[{10}]:} ',
\@UACS ,    \@UACS , \@UACS ,   \@UACS ,  \@UACS , \@UACS  ;

[download]

or the same thing using the repeat operator 

    use Perl6::Form;
    print form   {layout=>"across"},
        '{:[{10}]:} ' x 6 ,
        ( \@UACS ) x 6;

[download]

Place either right after  @UACS = sort(@UACS);, no splicing required, and @UACS remains full afterwards

In reply to Re^3: How to avoid "Use of uninitialized value" with printf? by Anonymous Monk
in thread How to avoid "Use of uninitialized value" with printf? by bobdabuilda

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