#!/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_dirichlet_beta.svg' fig = mplwp.fig_standard(mpl)  xlim = -8,8; fig.gca().set_xlim(xlim) ylim = -2,4; fig.gca().set_ylim(ylim) fig.gca().yaxis.set_major_locator(mpl.ticker.MultipleLocator(1)) mplwp.mark_axeszero(fig.gca())  import mpmath beta = lambda s: mpmath.dirichlet(s, [0, 1, 0, -1], 0) x = np.linspace(xlim[0], xlim[1], 5001) y = [beta(xx) for xx in x] plt.plot(x, y, label=u'\u03B2')  plt.legend(loc='upper center').get_frame().set_alpha(0.9)  plt.savefig(name) mplwp.postprocess(name)