 use to create a local cluster.  Must be an integer.  Defaults to
<code>1L</code>.</p></td>
    </tr>
    </table>


    <h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
    <pre class="examples"><div class='input'><span class='kw'>if</span> <span class='op'>(</span><span class='cn'>FALSE</span><span class='op'>)</span> <span class='op'>{</span>
<span class='co'>## This example is not run by default because even with very limitted number of</span>
<span class='co'>## 