cumulative sum in python
import pandas as pd
import numpy as np
# Create a dataframe
df1 = pd.DataFrame({"A":[None, 3, 8, 14],
"B":[1, None, 4, 3],
"C":[5, 3, 9,None]})
# Computing sum over Index axis
print(df1.cumsum(axis = 0, skipna = True))
#skipna exclude null valuesnumpy element sum privous
>>> a
array([[1, 2, 3],
[4, 5, 6]])
>>> np.cumsum(a,axis=0) # sum over rows for each of the 3 columns
array([[1, 2, 3],
[5, 7, 9]])
>>> np.cumsum(a,axis=1) # sum over columns for each of the 2 rows
array([[ 1, 3, 6],
[ 4, 9, 15]])Copyright © 2021 Codeinu
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