Extract Diagonal of a Matrix
Given an input matrix, diag2vec returns a column vector of the elements along the diagonal.
diag2vec(x)
x |
an input matrix. |
Similar to the function diag, except that the input argument is always
treated as a matrix (i.e., it doesn't have diag()'s functions of returning an Identity matrix from an nrow specification, nor to return
a matrix wrapped around a diagonal if provided with a vector). To get vector2matrix functionality, call vec2diag.
diag2vec(matrix(1:9, nrow=3)) # [,1] # [1,] 1 # [2,] 5 # [3,] 9 diag2vec(matrix(1:12, nrow=3, ncol=4)) # [,1] # [1,] 1 # [2,] 5 # [3,] 9
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