title: Why MATLAB returns an error using `conv` function?
body: <p>I'm using MATLAB 2015a. Even if I try to run document example of <code>conv</code> function, i get an error saying <code>Error using conv (line 15), Not enough input arguments.</code>.</p>
  
  <p>This is the example code I'm using:</p>
  
  <pre><code>u = [1 0 1];
  v = [2 7];
  w = conv(u,v)
  </code></pre>
  
  <p>What is the problem with my MATLAB?</p>