title: how to zoom axes in matlab
body: <p>I would like to add code in my function to zoom around a point, while keeping the option to un-zoom manually later.</p>
  
  <p>I can use <code>set(gca,'xlim',[x1 x2])</code>, but if I later try to get back to the original zoom using the magnifier glass, the axes are "stuck".</p>