I want to change the value of a line in an axes. What I tried is
myline = axes.plot(...)
xdata, ydata = myline.get_data()
for i in range(ydata.__len__()):
ydata[i] += 50
to shift all y values up by 50.
But I dont see the change I made, even after a show(). How can I force
the diagram to show the changed value?