title: Convert from ASCII code to string in MATLAB
body: <p>If I have a string in matlab, I can convert it to a vector of ASCII codes using <code>double</code>:</p>
  
  <pre><code>&gt;&gt; my_string = 'asd';
  &gt;&gt; double(my_string)
  
  ans =
  
      97   115   100
  </code></pre>
  
  <p>How can I go back the other way? i.e., if I have an ASCII code in a MATLAB vector, how can I create the corresponding string?</p>
  
  <p>e.g</p>
  
  <pre><code>ascii_codes = [97 115 100];
  </code></pre>
  
  <p>should be converted to...</p>
  
  <pre><code>my_string = 'asd'
  </code></pre>