nts"></a>Arguments</h2>
    <table class="ref-arguments">
    <colgroup><col class="name" /><col class="desc" /></colgroup>
    <tr>
      <th>base</th>
      <td><p>a character string with the base path to the directory. This is required.</p></td>
    </tr>
    <tr>
      <th>pre</th>
      <td><p>an optional character string with the prefix to add to
the base path. Non character strings will be coerced to character class.</p></td>
    </tr>
    <tr>
      <th>num</th>
      <td><p>an optional character st