[刷题] 统计首位数
作者:互联网
练习1:统计从1到100的阶乘中,1到9做首位的次数
Python
import matplotlib.pyplot as plt def first_digital(x): while x >= 10: x //= 10 return x if __name__ == '__main__': n = 1 frequency = [0]*9 for i in range(1,100): n *= i m = first_digital(n)-1 frequency[m] += 1 print(frequency) plt.plot(frequency,'r-',linewidth=2) plt.grid(True) plt.show()
本福特定律(第一数字定律):以1为首位数字出现的概率约30%,是直观想象1/9的三倍
标签:__,10,plt,首位,frequency,digital,100,统计,刷题 来源: https://www.cnblogs.com/cxc1357/p/10367548.html