docs: def setfig(fig=None,**kwargs):
      """
      Sets figure to 'fig' and clears; if fig is 0, does nothing (e.g. for overplotting)
  
      if fig is None (or anything else), creates new figure
      
      I use this for basically every function I write to make a plot.
      I give the function
      a "fig=None" kw argument, so that it will by default create a new figure.
  
      .. note::
  
        There's most certainly a better, more object-oriented
        way of going about writing functions that make figures, but
        this was put together before I knew how to think that way,
        so this stays for now as a convenience.
        
      """
      if fig:
          plt.figure(fig,**kwargs)
          plt.clf()
      elif fig==0:
          pass
      else:
          plt.figure(**kwargs)