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<html>
  <head>
    <title>wenergy2</title>
  </head>
  <body bgcolor="#FFFFFF">
    <center>Scilab Wavelet Toolbox Function  </center>
    <div align="right">Last update : June 2007  </div>
    <p>
      <b>wenergy2</b> - Energy Statistics from two dimension multiple level decompostion   </p>
    <h3>
      <font color="blue">Calling Sequence</font>
    </h3>
    <dl>
      <dd>
        <tt>[Ea,Ed]=wenergy(c,s)</tt>
      </dd>
      <dd>
        <tt>[Ea,Eh,Ev,Ed]=wenergy(c,s)</tt>
      </dd>
    </dl>
    <h3>
      <font color="blue">Parameters</font>
    </h3>
    <ul>
      <li>
        <tt>
          <b>Ea  </b>
        </tt>
    : energy percentage of approximation coefficent
  </li>
      <li>
        <tt>
          <b>Eh  </b>
        </tt>
    : energy percentage of horizontal detail coefficent
  </li>
      <li>
        <tt>
          <b>Ec  </b>
        </tt>
    : energy percentage of vertical detail coefficent
  </li>
      <li>
        <tt>
          <b>Ed  </b>
        </tt>
    : energy percentage of diagonal detail coefficent, vector
  </li>
      <li>
        <tt>
          <b>c  </b>
        </tt>
    : coefficent array
  </li>
      <li>
        <tt>
          <b>s  </b>
        </tt>
    : size array
  </li>
    </ul>
    <h3>
      <font color="blue">Description</font>
    </h3>
    <p>
  wenergy2 is to calculate the energy percentage of approximation and detail coefficent for two dimension decompostion.
  </p>
    <h3>
      <font color="blue">Examples</font>
    </h3>
    <pre>
  x=rand(100,100);
  [C,S]=wavedec2(x,3,'db2');
  [Ea,Ed]=wenergy2(C,S);
 </pre>
    <h3>
      <font color="blue">Author</font>
    </h3>
    <p>Roger Liu and Isaac Zhi  </p>
    <h3>
      <font color="blue">See Also</font>
    </h3>
    <p>
      <a href="wavedec2.htm">
        <tt>
          <b>wavedec2</b>
        </tt>
      </a>,&nbsp;&nbsp;<a href="waverec2.htm">
        <tt>
          <b>waverec2</b>
        </tt>
      </a>,&nbsp;&nbsp;</p>
  </body>
</html>