title: Evaluate symbolic expression
body: <pre><code> syms t;          % Define symbolic var x. 
   y = int( t^2 );  % Calculate integral of x; it should be t^3/3.
   x = [1:10]  
  </code></pre>
  
  <p>Now I want to calculate y(x), it should be [1/3, 8/3, .., 1000/3].</p>