python按照正态分布从列表中选择一个元素
作者:互联网
我想按照正态分布使用python从列表中选择一个元素。我有一个清单,例如
alist = ['an', 'am', 'apple', 'cool', 'why']
例如,根据正态分布的概率密度函数(PDF),给定列表中的第3个元素应该被选择为最大概率。
from random import normalvariate
defnormal_choice(lst, mean=None, stddev=None):
if mean is None:
# if mean is not specified, use center of list
mean = (len(lst) - 1) / 2
if stddev is None:
# if stddev is not specified, let list be -3 .. +3 standard deviations
stddev = len(lst) / 6
while True:
index = int(normalvariate(mean, stddev) + 0.5)
if 0 <= index < len(lst):
return lst[index]
然后
alist = ['an', 'am', 'apple', 'cool', 'why']
for _ in range(20):
print(normal_choice(alist))
给
why
an
cool
cool
cool
apple
cool
apple
am
am
apple
apple
apple
why
cool
cool
cool
am
am
apple
转载:https://qa.1r1g.com/sf/ask/2483072301/
标签:None,apple,python,am,列表,stddev,mean,正态分布,cool 来源: https://www.cnblogs.com/chentiao/p/16363666.html