title: Simple 2D cell array appending
body: <p>I have a 2D cell array.  I want to do the following:</p>
  
  <pre><code>y = some_number;
  row(x) = [row(x)  another_row(y)];
  </code></pre>
  
  <p>However, row(x) isn't defined until this happens so it doesn't work!  How do I simply append another_row(y) onto row(x) when row(x) may not be defined?</p>
  
  <p>Sorry this is easy to do in other languages but I'm not sure how in MATLAB!</p>
  
  <p>Thank you.</p>