python學習筆記:泊松分佈和負指數分佈隨機數的python實現
阿新 • • 發佈:2019-01-03
不能算是純原創吧,算半個轉載好了,但保證一定能用!
首先匯入模組
import math
import random
泊松分佈
def poisson(L): """ poisson distribution return a integer random number, L is the mean value """ p = 1.0 k = 0 e = math.exp(-L) while p >= e: u = random.random() #generate a random floating point number in the range [0.0, 1.0) p *= u k += 1 return k-1
負指數分佈
def expntl(L):
"""
negative exponential distribution
return a double random number, L is the mean value
"""
u = random.random()
return -L * math.log(u)
大可以迴圈個N次求平均來測試正確性!