* Sorry. This question is revised just now. Thank you very much! Hi, Thank you for your interest in my question. data is a text file (*.txt). the result would seem like this. 
             I  you  find  WMD  iraq  Holy war ....
paragraph 1      3     7    10
paragraph 2            10        5     7
paragraph 3            5               
paragraph 4  7
paragraph 5                                 10
paragraph 6
The first row is top 100 frequent words (in the text file). Numbers in each cell shows the frequency of the word in the data. The data is one text file (.txt) with more than 100000 words. Each "paragraph" is delimited by "-100". I need a matrix which shows the frequency of each word in each paragraph. I thought it is words-by-words matrix, but it's wrong. It's words-by-paragraph matrix. Thank you very much! Peace of the world.

In reply to a question about making a word frequency matrix by peacekorea

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.