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

"""

绘制散点图

"""

import numpy as np

import matplotlib.pyplot as plt

# 数据个数

n = 1024

# 均值为0, 方差为1的随机数

x = np.random.normal(0, 1, n)

y = np.random.normal(0, 1, n)

# 计算颜色值

color = np.arctan2(y, x)

# 绘制散点图

plt.scatter(x, y, s = 75, c = color, alpha = 0.5)

# 设置坐标轴范围

plt.xlim((-1.5, 1.5))

plt.ylim((-1.5, 1.5))

# 不显示坐标轴的值

plt.xticks(())

plt.yticks(())

plt.show()