matplotlib.pyplot画图

    import matplotlib.pyplot as plt 
    fig = plt.figure()
    ax = fig.add_subplot(111)
    ax.scatter(xcord1, ycord1, s = 30, c = 'red', marker = 's')
    ax.scatter(xcord2, ycord2, s = 30, c = 'green')
    x = arange(-3.0, 3.0, 0.1)
    y = (-weights[0] - weights[1] * x) / weights[2]
    ax.plot(x, y)
    plt.xlabel('X1'); plt.ylabel('X2')
    plt.show()

省略了一些前序过程，这里主要只讲画图过程。

1. plt.figure() 得到整幅图

2. fig.add_subplot(111) 得到子图

3. scatter()用于画散点图，具体参数见scatter文档

4. 

def arange(start, stop, step, , dtype)

5. plot()

6. show()

以后会持续补充