Adding elements to the diagonal of a matrix that is not square in R -

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i want able add value (in code nug) i,j entry of matrix = j (so kronecker delta function). easy when matrix square (see code below) not sure how in 1 line when matrix not square

nug = 2 r = tau + diag(nug,nrow(tau))

the above code works when tau square matrix imagine tau not square. how add nug each of i,j elements of tau = j?

m <- matrix(1:6, ncol = 2) m      [,1] [,2] [1,]    1    4 [2,]    2    5 [3,]    3    6 diag(m) <- diag(m) + 1:2 m      [,1] [,2] [1,]    2    4 [2,]    2    7 [3,]    3    6

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