How to calculate sum of squares of each cell for a row in dataframe?
Question:
i have a dataframe like this
Index
A
B
C
D
E
0
4
2
4
4
1
1
1
4
1
4
4
2
3
1
2
0
1
3
1
0
2
2
4
4
0
1
1
0
2
i want to take the square for each cell in a row and add them up then put the result in a column "sum of squares", how to do that ?
i expect this result :
Index
A
B
C
D
E
sum of squares
0
4
2
4
4
1
53
1
1
4
1
4
4
50
2
3
1
2
0
1
15
3
1
0
2
2
4
25
4
0
1
1
0
2
6
Answers:
By using apply()
and sum()
.
Code:-
import pandas as pd
lis=[(4,2,4,4,1),
(1,4,1,4,4),
(3,1,2,0,1),
(1,0,2,2,4),
(0,1,1,0,2)]
df = pd.DataFrame(lis)
df.columns =['A', 'B', 'C', 'D','E']
#print(df)
# Main code
new=df.apply(lambda num: num**2) #Square of each number stored in new.
#Creating new column sum_of_squares applying sum() function on new
df['sum_of_squares']=new.sum(axis=1)
print(df)
Output:-
A B C D E sum_of_squares
0 4 2 4 4 1 53
1 1 4 1 4 4 50
2 3 1 2 0 1 15
3 1 0 2 2 4 25
4 0 1 1 0 2 6
i have a dataframe like this
Index | A | B | C | D | E |
---|---|---|---|---|---|
0 | 4 | 2 | 4 | 4 | 1 |
1 | 1 | 4 | 1 | 4 | 4 |
2 | 3 | 1 | 2 | 0 | 1 |
3 | 1 | 0 | 2 | 2 | 4 |
4 | 0 | 1 | 1 | 0 | 2 |
i want to take the square for each cell in a row and add them up then put the result in a column "sum of squares", how to do that ?
i expect this result :
Index | A | B | C | D | E | sum of squares |
---|---|---|---|---|---|---|
0 | 4 | 2 | 4 | 4 | 1 | 53 |
1 | 1 | 4 | 1 | 4 | 4 | 50 |
2 | 3 | 1 | 2 | 0 | 1 | 15 |
3 | 1 | 0 | 2 | 2 | 4 | 25 |
4 | 0 | 1 | 1 | 0 | 2 | 6 |
By using apply()
and sum()
.
Code:-
import pandas as pd
lis=[(4,2,4,4,1),
(1,4,1,4,4),
(3,1,2,0,1),
(1,0,2,2,4),
(0,1,1,0,2)]
df = pd.DataFrame(lis)
df.columns =['A', 'B', 'C', 'D','E']
#print(df)
# Main code
new=df.apply(lambda num: num**2) #Square of each number stored in new.
#Creating new column sum_of_squares applying sum() function on new
df['sum_of_squares']=new.sum(axis=1)
print(df)
Output:-
A B C D E sum_of_squares
0 4 2 4 4 1 53
1 1 4 1 4 4 50
2 3 1 2 0 1 15
3 1 0 2 2 4 25
4 0 1 1 0 2 6