用Python学分析 - 散点图

# 运用散点图对数据分布得到直观的认识

import numpy as np
import matplotlib.pyplot as plt

# 设计 x, y 轴
n = 10000
x = np.random.randn( n ) # 随机值
y = np.random.randn( n )

# 显示散点图
colors = ['b','r','g','y','k','m']
plt.scatter(x, y, c = colors, marker = 'p', alpha=0.5 )
plt.title('Distribution')
plt.show()

# scatter( x, y, s = None, c = None, maker = None,
#          camp = None, norm = None, vmin = None, vmax = None, 
#          alpha = None, linewidth = None, vert = None, edgecolors = None,
#          hold = None, data = None, **kwargs
#        )
# x,y   - 形如shape(n,)的数组，可选值
# s - 点的大小（也就是面积）默认20
# c [color] - 点的颜色或颜色序列，默认蓝色。其它如c = 'r' (red); c = 'g' (green); c = 'k' (black) ; c = 'y'(yellow)
# marker 形状，可选值，默认是圆 [. , _ o v ^ < > 1 2 3 4 8 s p P * h H + x X D]

# alpha - 透明度，标量，可选，默认值：无， 0（透明）和1（不透明）之间的alpha混合值
# edgecolors - 边缘颜色或颜色序列，可选值，默认值：None

散点图结果：

结论：

从图像上看，散点呈均匀分布。