First a question: Your data appears to be entirely numeric. Why are you using hashes instead of arrays?

Secondly, your %newhash should not be empty after the copy operation, but be advised that it will contain references to the ORIGINAL second level hashes from the first assignment. Example: 

use strict;

use Data::Dumper;

my %first;
$first{'foo'}{'bar'} = 1;
$first{'foo'}{'baz'} = 2;
$first{'bah'}{'oof'} = 3;

print "First hash:\n";
print Dumper \%first;

my %second = %first;
print "\nSecond hash\n";
print Dumper \%second;

print "\nFirst nested hash address: $first{'foo'}\n";
print "Second nexted hash address: $second{'foo'}\n";

[download]

output: 

First hash:
$VAR1 = {
          'bah' => {
                     'oof' => 3
                   },
          'foo' => {
                     'baz' => 2,
                     'bar' => 1
                   }
        };

Second hash
$VAR1 = {
          'bah' => {
                     'oof' => 3
                   },
          'foo' => {
                     'baz' => 2,
                     'bar' => 1
                   }
        };

First nested hash address: HASH(0x804ee40)
Second nexted hash address: HASH(0x804ee40)

[download]

In reply to Re: Copying a hash to another hash problem by mfriedman
in thread Copying a hash to another hash problem by Anonymous Monk

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.