#!/usr/bin/python # -*- coding: utf8 -*-  import matplotlib.pyplot as plt import matplotlib as mpl import numpy as np from math import *  code_website = 'http://commons.wikimedia.org/wiki/User:Geek3/mplwp' try:     import mplwp except ImportError, er:     print 'ImportError:', er     print 'You need to download mplwp.py from', code_website     exit(1)  name = 'mplwp_arcoth.svg' fig = mplwp.fig_standard(mpl)  xlim = -5.5,5.5; fig.gca().set_xlim(xlim) ylim = -3,3; fig.gca().set_ylim(ylim) fig.gca().xaxis.set_major_locator(mpl.ticker.MultipleLocator(1)) mplwp.mark_axeszero(fig.gca())  f = lambda x: 1.0 / tanh(x) if abs(x) > 1e-2 else float('NaN') y = np.linspace(ylim[0], ylim[1], 5001) x = [f(yy) for yy in y]  plt.plot(x, y, label='arcoth') plt.legend(loc='upper left').get_frame().set_alpha(0.9)      plt.savefig(name) mplwp.postprocess(name)