# 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

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Source: www.geeksforgeeks.org

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Contributed on Dec 26 2021

Busy Bird

0 Answers Avg Quality 2/10

numpy get diagonal matrix from matrix

Comment

np.diag(np.diag(x))

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Source: Grepper

Tags: diagonal diagona

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Contributed on Apr 30 2021

Clumsy Capuchin

0 Answers Avg Quality 2/10

sum of diagonal elements of a matrix python without numpy

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class Solution(object):
    def diagonalSum(self, array):
        """
        :type array: List[List[int]]
        :rtype: int
        """
        n = len(array)
        primary = 0
        secondary = 0;
        for i in range(0, n):
            primary += array[i][i]
            secondary += array[i][n-i-1]
        if (n % 2 == 0): return primary + secondary
        else: return primary + secondary - array[n//2][n//2]

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Source: Grepper

Tags: diagonal elements matrix numpy python sum

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Contributed on May 23 2022

Mayur Rewatkar

0 Answers Avg Quality 2/10

what 2 numpy commands can create a array with diagonal 1s

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np.eyes(), np.identity()

[[1. 0. 0. 0. 0.]
  [0. 1. 0. 0. 0.]
  [0. 0. 1. 0. 0.]
  [0. 0. 0. 1. 0.]
  [0. 0. 0. 0. 1.]]

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Source: blackboard.waketech.edu

Tags: diagonal numpy python

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Contributed on Mar 04 2023

Tomas Alvarez

0 Answers Avg Quality 2/10

sum of diagonal numpy

Comment

-1

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

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

result=sum(a)
print(result)

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Source: numpy.org

Tags: diagonal diagona

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Contributed on Nov 12 2020

Ferry_Morris

0 Answers Avg Quality 2/10

how to sum numpy matrix diagonal

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