练习：绘制X^X函数

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#coding:utf-8
#/usr/bin/python
import numpy as np
import matplotlib as mpl
import matplotlib.pyplot as plt

def f(x):
    y = np.ones_like(x)
    i = x > 0
    y[i] = np.power(x[i], x[i])
    i = x < 0
    y[i] = np.power(-x[i], -x[i])
    return y


if __name__ == '__main__':
    mpl.rcParams['font.sans-serif'] = [u'SimHei']
    mpl.rcParams['axes.unicode_minus'] = False  # win正常显示中文设置
    
    plt.figure(facecolor='w')
    x = np.linspace(-1.3, 1.3, 101)
    y = f(x)
    plt.plot(x, y, 'g-', label='x^x', linewidth=2)
    plt.grid()
    plt.legend(loc='upper left')
    plt.show()