diagonal matrix in R?

The matrix you have isn't exactly diagonal since it isn't square. However, you can see there's a diagonal matrix in there.

The following code reproduces the matrix

 A1 <- diag(-1,6) ## creates a 6x6 diag with -1 on the diag A2 <- c(rep(0,5),1) ## make the bottom row A <- rbind(A1,A2) ## put A1 on top of A2 

Then you can see

 > A [,1] [,2] [,3] [,4] [,5] [,6] -1 0 0 0 0 0 0 -1 0 0 0 0 0 0 -1 0 0 0 0 0 0 -1 0 0 0 0 0 0 -1 0 0 0 0 0 0 -1 A2 0 0 0 0 0 1 

You can try the following:

import numpy as np A = np.zeros((7,6)) j = 0 for i in range(6): A[j,i] = -1 j= j+ 1 A[j,5] = 1 print(A)