title: Most efficient way of unpacking cell array with one nested level
body: <p>I am using <code>cellfun</code> with <code>UniformOutput</code> set to 0. This applies the specified function to each cell, returning the output as a cell in a cell array.</p>
  
  <p>Each of these cells are a cell array with 1 row and 6 columns. For example, a cell array with two cells:</p>
  
  <pre><code>ans =
  {
    [1,1] =
    {
      [1,1] = 1
      [1,2] = 1
      [1,3] = 1
      [1,4] = 9
      [1,5] = hello
      [1,6] = 3
    }
    [2,1] =
    {
      [1,1] = 1
      [1,2] = 1
      [1,3] = 1
      [1,4] = -33
      [1,5] = world
      [1,6] = 3
    }
  }
  </code></pre>
  
  <p>I would like to know the most efficient way to convert this into the 2x6 cell array, i.e.:</p>
  
  <pre><code>ans = 
    {
      [1,1] = 1
      [1,2] = 1
      [1,3] = 1
      [1,4] = 9
      [1,5] = hello
      [1,6] = 3 
      [2,1] = 1
      [2,2] = 1
      [2,3] = 1
      [2,4] = -33
      [2,5] = world
      [2,6] = 3
    }
  </code></pre>