title: dataTable fnUpdate row with new value
body: <p>I am using datatables and have this <code>tr</code> element in <code>table</code></p>
  
  
  
  <pre><code>&lt;tr class="gradeA even row_selected" id="3692"&gt;
    &lt;td class=" sorting_1"&gt;3692&lt;/td&gt;
    &lt;td class=""&gt;koza&lt;/td&gt;
    &lt;td class="" title="10:12:30"&gt;2013-12-31&lt;/td&gt;
    &lt;td class=""&gt;2014-02-06&lt;/td&gt;
    &lt;td class=""&gt;FULL packet&lt;/td&gt;
    &lt;td class=""&gt;NONE&lt;/td&gt;
    &lt;td class=""&gt;Name&lt;/td&gt;
  &lt;/tr&gt;
  </code></pre>
  
  <p>I would like to update 1st and 4th <code>td</code> element using <code>fnUpdate</code> function. I have tried to update for only one <code>td</code> but it does not update.<br>
  In Chrome, console log I am getting this error:             </p>
  
  <blockquote>
    <p>Uncaught TypeError: Cannot set property '_aData' of undefined </p>
  </blockquote>
  
  <p>Here is what I have tried:</p>
  
  <pre><code> // dynamically update row
   $('#example').dataTable().fnUpdate( ['Zebra'], parseInt('3692'));
  </code></pre>
  
  <p><code>3692</code> is the id of the <code>td</code> element to know which row I need to update, and the <code>zebra</code> is the value to change. I know that I have not included which cell to update but I don't know how to do that. On datatables api, following example is given:</p>
  
  <pre><code>oTable.fnUpdate( ['a', 'b', 'c', 'd', 'e'], 1 ); // Row
  </code></pre>