Scatter

• 表达形式
  matplotlib.pyplot.scatter(x, y, s=20, c=None, marker='o',...)
• 参数
  1、x/y：array_like, shape (n, ),
  input data
  2、s：scalar or array_like, shape (n, ), optional, default: 20
  size in points^2
  3、c：color, sequence, or sequence of color, optional, default: ‘b’
  c can be a single color format string, or a sequence of color specifications of length N
• Example

import numpy as np
import matplotlib.pyplot as plt
N = 50
x = np.random.rand(N)
y = np.random.rand(N)
colors = np.random.rand(N) #作为序列时，数目应与x长度相同
area = np.pi * (15 * np.random.rand(N))**2  # 0 to 15 point radiuses。半径在0-15之间，area为面积的平方。也可使用标量统一大小
plt.scatter(x, y, s=area, c=colors, alpha=0.5)
plt.show()