title: How to change the font size of a plot's title and axis labels and save it?
body: <p>Every time I save a plot picture as jpg or png, font size of title and axis label is changed back to default automatically. My code is like this:</p>
  
  <pre><code>figure
  plot(x, f(x))
  title('the smallest n = 1', 'FontSize', 24);
  xlabel('x', 'FontSize', 24);
  ylabel('x''', 'FontSize', 24);
  </code></pre>
  
  <p>After saving the picture, those font sizes become small again. Anyone knows why?</p>