# -*- coding: utf-8 -*-

"""

figure的使用

"""

import matplotlib.pyplot as plt

import numpy as np

#

x = np.linspace(-1, 1, 50)

# figure 1

y1 = 2 * x + 1

plt.figure()

plt.plot(x, y1)

# figure 2

y2 = x**2

plt.figure()

plt.plot(x, y2)

# figure 3，指定figure的编号并指定figure的大小, 指定线的颜色, 宽度和类型

#一个坐标轴上画了两个图形

y2 = x**2

plt.figure(num = 5, figsize = (4, 4))

plt.plot(x, y1)

plt.plot(x, y2, color = 'red', linewidth = 1.0, linestyle = '--')

plt.show()