File:Mplwp gamma.svg

#!/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_gamma.svg'
fig = mplwp.fig_standard(mpl)

xlim = -4,4; fig.gca().set_xlim(xlim)
ylim = -5,5; fig.gca().set_ylim(ylim)
fig.gca().yaxis.set_major_locator(mpl.ticker.MultipleLocator(1))
mplwp.mark_axeszero(fig.gca())

import mpmath
for i, tlim in enumerate([(-4, -3), (-3, -2), (-2, -1), (-1, -0), (0, 4)]):
    if tlim[1] <= 0.0:
        x = np.linspace(tlim[0], tlim[1], 1001)[1:-1]
    else:
        x = np.linspace(tlim[0], tlim[1], 4001)[1:]
    y = [mpmath.gamma(xx) for xx in x]
    if i == 0:
        plt.plot(x, y, label=u'\u0393')
    else:
        plt.plot(x, y, color=fig.gca().lines[-1].get_color())

plt.legend(loc='lower right').get_frame().set_alpha(0.9)

plt.savefig(name)
mplwp.postprocess(name)