Similar to subplot(), position_figure() divides the screen into rectangular
panes to position figures in.
position_figure(no_rows, no_columns, fig_no)
'no_rows' is the total number of figure-rows
'no_columns' is the total number of figure-columns
'fig_no' is the running number of the current figure
Example: position_figure(2, 3, 4) divides the screen into 6 rectangles that
are arranged in 2 rows and 3 columns. The current figure is placed
in the lower left corner of the screen.
* gave variables speaking names