gistfile1.txt

# -*- coding: utf-8 -*-
import matplotlib.pyplot as plt
import numpy

hl, = plt.plot([], [])
#plt.show()

def update_line(hl, new_data):
    hl.set_xdata(numpy.append(hl.get_xdata(), new_data))
    hl.set_ydata(numpy.append(hl.get_ydata(), new_data))

    #ax.relim()
    #ax.autoscale_view()

    plt.draw()

arrayLen = 10
data = numpy.random.rand(arrayLen) # zero-based indexing

update_line(hl, data)

while True:
    ind = numpy.random.randint(0,arrayLen-1)
    data[ind] = data[ind] + 1
    print data
    update_line(hl, data)