#!/usr/bin/python2.5from pylab import *from numpy import *# create a figurefigure(figsize=(7.5,2.5))rcParams.update({"figure.subplot.left":0.05, "figure.subplot.right":0.95,                 "figure.subplot.bottom":0.1, "figure.subplot.top":0.9,                 "svg.embed_char_paths":False})# x coords from -1 to 11x_fine = linspace(-0.4, 10.4, 1000)x_coarse = linspace(0, 10, 11)# sinewave w/ freq=0.9y1 = sin(2*pi * 0.9 * (x_fine-0.5))plot( x_fine, y1, "-", color="red")# sinewave w/ freq=0.1y2 = sin(2*pi * 0.1 * (x_fine-0.5))plot(x_fine, y2, "-", color="blue")# show aliasingy3 = sin(2*pi * 0.1 * (x_coarse-0.5))plot( x_coarse, y3, "o", color="black" )vlines( x_coarse, 0, y3, color="black" ) # add the "lollipop" points# set window and tick labelsaxis([-0.5, 10.5, -1.1, 1.1])yticks((-1.0,0,1.0), ('',0,''))xticks(linspace(0,10,11))# save itsavefig("AliasingSines.svg", transparent=True)