code: def add_text_table(self, rows, r0, dr, **kwargs):
          
          for m, row in enumerate(rows):
              for n, column in enumerate(row):
                  self.plt.text(r0[0] + dr[0] * n, r0[1] + dr[1] * m, column,
                      transform=self.plt.axes.transAxes, **kwargs)
docs: Add text to a plot in a grid fashion.
  
          `rows` is a list of lists (the rows).
          Each row contains the columns,
          each column is text to add to the plot.
  
          `r0` is a tuple `(x, y)` that positions the initial text.
  
          `dr` is a tuple `(dx, dy)` that determines the column and row spacing.
  
          Any keyword arguments will be passed to `matplotlib.pyplot.text`.
  
          Example:
  
              #!python
              >>> rows = [ ['a', '=', '1'], ['b', '=', '2'] ]
              >>> self.add_text_table(rows, (0.1, 0.9), (0.1, -0.1),
                      horizontalalignment='left',
                      verticalalignment='top')
  
          [1]: http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.text