matplotlib基础知识

以下是关于matplotlib基础知识的介绍和演示：

1. 绘制静态图像：

import matplotlib.pyplot as plt
import numpy as np

x = np.linspace(0, 2*np.pi, 100)
y = np.sin(x)

plt.plot(x, y)
plt.xlabel('x')
plt.ylabel('y')
plt.title('Sine Curve')
plt.show()

2. 绘制动态图像：

import matplotlib.pyplot as plt
from matplotlib import animation
import numpy as np

fig, ax = plt.subplots()
x = np.arange(0, 2*np.pi, 0.01)

line, = ax.plot(x, np.sin(x))

def animate(i):
    line.set_ydata(np.sin(x + i/10.0))
    return line,

def init():
    line.set_ydata(np.sin(x))
    return line,

ani = animation.FuncAnimation(fig, animate, frames=100, init_func=init, interval=20, blit=True)
plt.show()

3. 添加图例：

import matplotlib.pyplot as plt
import numpy as np

x = np.linspace(0, 2*np.pi, 100)
y1 = np.sin(x)
y2 = np.square(x)

plt.plot(x, y1, color='red', linewidth=1.0, linestyle='--', label='Sine Curve')
plt.plot(x, y2, label='Square Curve')
plt.xlabel('x')
plt.ylabel('y')
plt.title('Sine and Square Curves')
plt.legend()
plt.show()