code: def trace(
      data, name, format='png', datarange=(None, None), suffix='', path='./', rows=1, columns=1,
          num=1, last=True, fontmap = None, verbose=1):
      
  
      if fontmap is None:
          fontmap = {1: 10, 2: 8, 3: 6, 4: 5, 5: 4}
  
      # Stand-alone plot or subplot?
      standalone = rows == 1 and columns == 1 and num == 1
  
      if standalone:
          if verbose > 0:
              print_('Plotting', name)
          figure()
  
      subplot(rows, columns, num)
      pyplot(data.tolist())
      ylim(datarange)
  
      # Plot options
      title('\n\n %s trace' % name, x=0., y=1., ha='left', va='top',
           fontsize='small')
  
      # Smaller tick labels
      tlabels = gca().get_xticklabels()
      setp(tlabels, 'fontsize', fontmap[max(rows / 2, 1)])
  
      tlabels = gca().get_yticklabels()
      setp(tlabels, 'fontsize', fontmap[max(rows / 2, 1)])
  
      if standalone:
          if not os.path.exists(path):
              os.mkdir(path)
          if not path.endswith('/'):
              path += '/'
          # Save to file
          savefig("%s%s%s.%s" % (path, name, suffix, format))
docs: Generates trace plot from an array of data.
  
      :Arguments:
          data: array or list
              Usually a trace from an MCMC sample.
  
          name: string
              The name of the trace.
  
          datarange: tuple or list
              Preferred y-range of trace (defaults to (None,None)).
  
          format (optional): string
              Graphic output format (defaults to png).
  
          suffix (optional): string
              Filename suffix.
  
          path (optional): string
              Specifies location for saving plots (defaults to local directory).
  
          fontmap (optional): dict
              Font map for plot.