减去DataFrame列中的元素

Question

有没有一种功能可以让人们减去带有数据框列的元素？例如，假设一个数据框列中具有以下值：

1
2
3
4
5

让我们假设1是元素i，2是元素i + 2，依此类推。一个人如何从i + 4中减去i？

Answer 1

这对您有帮助吗？

import numpy as np
import pandas as pd
df = pd.DataFrame(np.random.randint(0,100,size=(100, 4)), columns=list('ABCD')) #create random data frame 
iterate_to=df.shape[0]-4 #specify how far you'll be iterating to
#iterating further than the number of rows will cause an error
differences=[] #create a list into which the calculated differences will be put
for i in range(0,iterate_to): #iterate through the rows 1 at a time
     differences.append(df['A'][i+4]-df['A'][i]) #append the differences between i and i+4