title: matlab - plot - conversion to double from sym is not possible
body: <p>I'm having some problems with my code. Here is it:</p>
  <pre><code>syms I t v;
  v = t*exp(-t);
  I = int(v,t)
  t = linspace(0,10);
  plot(t, I)
  </code></pre>
  <p>When i try to plot, i get ??? Error using ==&gt; plot
  Conversion to double from sym is not possible.
  I tried many ways but it doesn't work.
  I'm new to matlab so I don't know much. Hope to get help from everybody. Thank you so much.</p>