Category "diagonal"

R: create diagonal from 1 to 10 in matrix -> returns only last value

I need to modify a matrix filled with random numbers so that the resulting matrix has a diagonal with the numbers 1 to 10 and everywhere else there are supposed

Singular Value Decomposition (SVD) outputs a 1-D singular value array, instead of 2-D diagonal matrix [Python]

I was posting a question on similar subject, and encountered another more important question. When I apply SVD to a matrix 'A' (code below) the output I get is

Pythonic way to get both diagonals passing through a matrix entry (i,j)

What is the Pythonic way to get a list of diagonal elements in a matrix passing through entry (i,j)? For e.g., given a matrix like: [1 2 3 4 5] [6 7 8