Based on your questions to date, 
917552     Re^2: list from file     2011-07-29 16:45
917540     list from file     2011-07-29 15:24
917434     Re^6: array in hashes     2011-07-29 05:44
917421     Re^4: array in hashes     2011-07-29 04:36
917414     Re^2: array in hashes     2011-07-29 04:04
917406     array in hashes     2011-07-29 03:14
917302     Re: array of arrays     2011-07-28 12:16
917230     Re^4: finding neighbors of an element in arrays     2011-07
+-28 04:42
917222     Re^4: finding neighbors of an element in arrays     2011-07
+-28 04:27
917211     finding neighbors of an element in arrays     2011-07-28 03
+:19

[download]
it appears that it's time for you to start actually studying Perl (aka, one hopes, "learning Perl") rather than simply asking each question as it occurs to you.

It's our goal to help you learn; not to provide an unlimited, question-by-question answer-service.

Also, pay strict attention to Not_a_Number's request for clarity... and the caution about crediting the source of code you post; this community takes a very serious view of plagarism and its various cousins.

In reply to Re^3: list from file by ww
in thread list from file by persianswallow

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.