8. Calculate sum of diagonals of matrix using Python

Hello Learners!!
In this video, we are going to learn how to calculate the sum of diagonals of a matrix using Python
We will solve this using two approaches:
1 Using the Nested list
2. Using NumPy Library
Timeline:
00:00 Introduction
02:24 Calculating the sum of primary diagonal elements using nested lists
07:02 Calculating the sum of secondary diagonal elements using nested lists (Approach 1)
11:56 Calculating the sum of secondary diagonal elements using nested lists (Approach 2)
16:57 Calculating the sum of diagonal elements using NumPy
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[prachisaxena]

Thanks for such a nice and comprehensive solution. Keep helping. Really appreciate.

[MoneyAndProfit]

Thanx to your wonderful efforts. This is easiest way, love you so much and effort. Keep it up

[suddenly]

Thank you for this content! The only video that made me understand this topic
Love your accent

[rachankumar]

# Sum of secondary principal diagonal elements of a matrix

A = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
n=4
for i in range(len(A)): # Corrected
for j in range(len(A[i])): # Corrected
if ((i+j) == (n-1)):
print(A[i][j])
sum = 0
for i in range(len(A)):
for j in range(len(A[i])):
if ((i+j) == (n-1)):
sum = sum + A[i][j]
print("sum:", sum)



Output: 6
8



What is the wrong with this code mam, output coming is incorrect



Please reply madam

[ajeetshahu]

ma'am, I have one doubt, for an odd square matrix how to find the sum of all diagonal matrix without repetition of any element

[gayathri--is]

Mam, clearly understood ....Thanq so much mam for ur efforts fr me mam...U will have a nice future in this platform I think so...As a viewer, my advice is that try to avoid mistakes mam...It may increasing the time ...Viewers also expect the shortest video...

[mariomathew]

ans, n = 0, len(a)
for i in range(len(a)):
ans += a[i][i]
ans += a[i][n-1-i]
return ans-(a[n//2][n//2] if n%2 else 0)

[gayathri--is]

Mam, can I expect some more videos ..Bcoz I was searching but I didnt get the clear understanding of the program

[alokik]

Respected mam,
Instead of taking j = n-i-1, can we take i+j = len(matrix)?
would it work ?

[elenagavrilova]

it is impossible to listen to... even if it contains a good explanation, sorry.