title: Evaluate symbolic function in Matlab
body: <p>I've defined a function in Matlab like this:
  <code>clg = 2*pi*(alpha-alphai+0.5*A(1));</code>
  where A is an array which depends on <code>alpha</code>.
  I want to evaluate <code>clg</code> for <code>aplha=0.53</code>.
  I've tried <code>subs(clg, alpha, 0.53)</code>, but It gives me a bunch of weird errors:</p>
  
  <pre><code>Error using sym/subs&gt;normalize (line 210)
  Entries in second argument must be scalar.
  
  Error in sym/subs&gt;mupadsubs (line 136)
  [X2,Y2,symX,symY] = normalize(X,Y); %#ok
  
  Error in sym/subs (line 124)
      G = mupadsubs(F,X,Y);
  
  Error in integral (line 45)
  subs(clg, alpha, 0.53)
  </code></pre>
  
  <p>Any idea on how to achieve that?
  Thanks!</p>