title: Octave Get function_handle from vectorfunction with constants
body: <p>I've tried to get a vectorfunction like</p>
  <pre><code>  syms x
     fn=function_handle([x^2;1])
  </code></pre>
  <p>Output is @(x) [x.^2;1]</p>
  <p>Thats leads of course in an error while calling fn with vectorarguments
  (Dimensions mismatch)
  Is there a way to avoid the issue?</p>
  <p>I've tried <code>fn=function_handle([x^2;1+0*x])</code></p>
  <p>but the codeoptimation - or whatever - deletes the  0*x - term.</p>
  <p>Any suggestions?</p>