code: def trim(self, n='all', x=True, y=True):
          
          if len(self._set_xdata)==0 or len(self._set_ydata)==0:
              self._error("No data. Please use set_data() and plot() prior to trimming.")
              return
          
          if _s.fun.is_a_number(n): n = [n]
          elif isinstance(n,str):   n = list(range(len(self._set_xdata)))
  
          # loop over the specified plots
          for i in n:
              try:
                  if x:
                      xmin, xmax = _p.figure(self['first_figure']+i).axes[1].get_xlim()
                      self['xmin'][i] = xmin
                      self['xmax'][i] = xmax
  
                  if y:
                      ymin, ymax = _p.figure(self['first_figure']+i).axes[1].get_ylim()
                      self['ymin'][i] = ymin
                      self['ymax'][i] = ymax
  
              except:
                  self._error("Data "+str(i)+" is not currently plotted.")
  
          # now show the update.
          self.clear_results()
          if self['autoplot']: self.plot()
  
          return self
docs: This will set xmin and xmax based on the current zoom-level of the
          figures.
  
          n='all'     Which figure to use for setting xmin and xmax.
                      'all' means all figures. You may also specify a list.
          x=True      Trim the x-range
          y=True      Trim the y-range