title: How to use set_data with semilogx?
body: <p>I'm currently doing,</p>
  
  <pre><code>self.fig = Figure()
  self.axes = self.fig.add_subplot(111)
  self.axes.semilogx(omega,mag,*args,**kwargs)
  </code></pre>
  
  <p>I would like to use <code>set_data</code> to only change the data points.
  How to go about it?</p>