Python diagonal sum

# A simple Python3 program to find
# sum of diagonals
MAX = 100
 
def printDiagonalSums(mat, n):
 
    principal = 0
    secondary = 0
    for i in range(0, n):
        principal += mat[i][i]
        secondary += mat[i][n - i - 1]
         
    print("Principal Diagonal:", principal)
    print("Secondary Diagonal:", secondary)
 
# Driver code
a = [[ 1, 2, 3, 4 ],
     [ 5, 6, 7, 8 ],
     [ 1, 2, 3, 4 ],
     [ 5, 6, 7, 8 ]]
printDiagonalSums(a, 4)
 
# This code is contributed
# by ihritik

Source: geeksforgeeks.org

Sum of diagonal numpy

arr= np.arange(16)
arr= np.reshape(arr,(4,4))

a=np.diagonal(arr, 0,0,1)

result=sum(a)
print(result)

-1

Source: numpy.org

Similar codes

0 vote157 views1 answer
How to convert data into numerical dataset
Python
0 vote144 views1 answer
Python max function with lambda
Python
1 vote170 views1 answer
Charts in python
Python
0 vote206 views1 answer
Use loc for change values pandas
Python
11 votes159 views3 answers
Count repeat values in python list
Python
0 vote154 views1 answer
Model.fit(X_train, Y_train, batch_size=80, epochs=2, validation_split=0.1)
Python
0 vote163 views1 answer
Python generate html
Python
0 vote142 views4 answers
Getting the number of missing values in pandas
Python
39 votes176 views4 answers
Round off float to 2 decimal places in python
Python
0 vote170 views1 answer
Ipywidgets label text color
Python