from matplotlib.pyplot import *
from numpy import linspace
from mpl_toolkits.axisartist import *
xlim, ylim = 10, 15
x = linspace(-xlim,xlim,301)
y = (x**2-3.*x-2.)/(x**2-4.)

fig = figure(figsize=(5,5))
ax = Subplot(fig,"111")
fig.add_subplot(ax)
ax.axis[:].set_visible(False)
ax.axis["x"] = ax.new_floating_axis(0,0)
ax.axis["y"] = ax.new_floating_axis(1,0)
ax.axis["y"].set_axis_direction("right")
ax.plot(x,y,linewidth=1.)
ax.plot([2,2],[-ylim,ylim],'k--',linewidth=.5)
ax.plot([-2,-2],[-ylim,ylim],'k--',linewidth=.5)
ax.plot([2,2],[-ylim,ylim],'k--',linewidth=.5)
ax.plot([-xlim,xlim],[1,1],'k--',linewidth=.5)
ax.grid(False)
ax.set_ylim(-ylim,ylim)
ax.set_xlim(-xlim,xlim)
ax.minorticks_on()
fig.savefig("RationalDegree2byXedi.svg",bbox_inches="tight",\
	pad_inches=.15)