Python Jupyter Notebook 无法正确应用函数

Question

我有一个 jupyter 笔记本，其中使用逻辑函数返回一个标准化的数组。

代码:

import math
import numpy as np

# takes a list of numbers as input
def logistic_transform(nums):
    e = math.e
    print(e)
    print(nums)
    for num in nums:
        num = 1 / 1 + (e ** num)
    return nums

input = [1, 2, 3]
test = logistic_transform(input)
print(test)

输出为:

2.718281828459045
[1, 2, 3]
[1, 2, 3]

为什么更改没有应用于 input[] 中的值？

Answer 1

只需将您的结果放入另一个列表即可!

import math
import numpy as np
p_num =[]
# takes a list of numbers as input
def logistic_transform(nums):
    e = math.e
    print('e',e)
    print('nums',nums)
    for num in nums:
        p_num.append(1 / 1 + (e ** num))
return  p_num

input = [1, 2, 3]
test = logistic_transform(input)
print('test',test)

e 2.718281828459045

数字[1,2,3]

测试[3.718281828459045、8.389056098930649、21.085536923187664]