title: how to combine matplotlib figures after they are saved?
body: <p>I know that the ideal solution would be to plot them in multiple axes by calling <code>plt.subplots(nrows=x, ncols=y)</code> but the code where I am plotting was already structured in a way which would make it very hard for me to convert to plotting in the same context like that...</p>
  <p>So that being said, I have a folder with 5 saved <code>.pdf</code> images that were created in matplotlib. Is there a way I can open these up and save them in the same file while maintaining the <code>.pdf</code> filetype (i.e. not converting them to <code>.png</code>s in some image editing program)?</p>