英文:
Why aren't the values from the for loop appending to the array?
问题
p = []for i in range(6):p.append(P(u[i]))p = np.array(p)print(p)print(type(p))
英文:
I'm trying to append values from a for loop into a numpy array. While the values are correct, the array only returns none values. The values entered are from another numpy array.
import numpy as npimport matplotlib.pyplot as pltj=np.array([14,15,16,16,16,22,22,24,24,25,25,25,25,25])u=np.unique(j)def P(age):sum=0for i in range(14):if j[i]==age:sum=sum+1else:sum=sumprint(sum/14)p = []for i in range(6):p.append(P(u[i]))p=np.array(p)print(p)print(type(p))
Output:
0.071428571428571420.071428571428571420.214285714285714270.142857142857142850.142857142857142850.35714285714285715[None None None None None None]<class 'numpy.ndarray'>
答案1
得分: 0
函数 "P" 没有返回值，因此每次返回 None。
英文:
Function "P" doesn't have a return function, hence equaling None each time.
def P(age):sum=0for i in range(14):if j[i]==age:sum=sum+1else:sum=sumprint(sum/14)return sum/14
Shown here ^, you can return the sum.
答案2
得分: 0
因为您的函数 P() 没有 return 语句，即它返回 None。
您可能想要更改此函数定义的最后一条语句，即语句
print(sum/14)
为
return sum/14
（或在 print(sum/14) 后追加此 return 语句）。
英文:
Because your function P() has no return statement, i.e. it returns None.
You probably want to change the last statement of this function definition, i.e. the statement
print(sum/14)
to
return sum/14
(or append this return statement after your print(sum/14).)
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