polar_scatter.py

非原创。很好的python例子

#!/usr/bin/env python
# a polar scatter plot; size increases radially in this example and
# color increases with angle (just to verify the symbols are being
# scattered correctlu).  In a real example, this would be wasting
# dimensionlaity of the plot
from pylab import *

N = 150
r = 2*rand(N)
theta = 2*pi*rand(N) 
area = 200*r**2*rand(N)
colors = theta
ax = subplot(111, polar=True)
c = scatter(theta, r, c=colors, s=area)
c.set_alpha(0.75)

#savefig('polar_test2')
show()