title: Adding objects in Multidimensional NSMutableArray
body: <p>I'm quite confused on how to add objects in multidimensional arrays.</p>
  
  <p>Is initializing multidimensional arrays are the same with just a simple array?</p>
  
  <p>This is my initialization.</p>
  
  <pre><code>testList = [[NSMutableArray alloc] init];
  </code></pre>
  
  <p>I need to do something like</p>
  
  <pre><code>testList[i][j] = item;
  </code></pre>
  
  <p>i tried</p>
  
  <pre><code>[[[testList objectAtIndex:i]objectAtIndex:j] addObject:item];
  </code></pre>
  
  <p>but it doesn't seem to work :(</p>