'''
   20211107
   
   Robin Dawes
   
   Simple demo of pyplot from matplotlib
'''

from matplotlib import pyplot as plt	# it is traditional to use plt as the short name

points_1 = []
points_2 = []
num_points = 500
for i in range(num_points):            # You can make num_points a lot higher than this.
                                                       # The graph will scale automatically.
	points_1.append(14*i + 6)		
	                # just a random function for illustration purposes
	points_2.append(0.05*i**2 + 21)		
	                # another one
	
fig = plt.figure(figsize=(20,8))			
                    # these numbers were chosen to make a big window - you	
                    # may find other values to be more suitable for your screen

fig.suptitle("Plotting two Functions")
                    # add a title to the figure
					
plt.plot(points_1, label="14*i + 6") 
                    # add this list of points to the figure, joined by a line
                    
plt.plot(points_2, label="0.05*i**2 + 21") 
                    # add the other line to the figure
                    
plt.legend()        # add the labels to the figure
plt.show()          # display the graph