Running this with use strict reveals a helpful error: 

  Global symbol "%P" requires explicit package name

[download]
in the line containing @e = $@{$P{'E'}};

$P is a reference, whereas $P{'E'} refers to a simple hash variable, called %P. Since you wish to use the reference, you will need to dereference it back to the hash %$P, using either: 

  $$P{'E'}

[download]
or 
  $P->{'E'}

[download]

Now, since that is also a reference to an array, you will need to dereference that with; 

  @{$P->{'E'}}

[download]
So the line which strict reports in error should be: 
  @e = @{$P->{'E'}};

[download]

Hope that helped,
use strict; # it's the right thing to do
-v
"Perl. There is no substitute."

In reply to Re: How to copy an list from a reference hash? by Velaki
in thread How to copy an list from a reference hash? by lazurwol

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.