#!/usr/bin/python3
import sys
import matplotlib.pyplot as plt
from numpy import *
l = 15.5
x = arange(-l,l,.2)
y = sin(x)/x
plt.ion()
fig,ax = plt.subplots()
line, = ax.plot(x,y)
plt.show()
while True:
   data = sys.stdin.buffer.read(1)
   y += .01
   line.set_ydata(y)
   fig.canvas.draw()
#   sys.stdout.write("r\n"+data)