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diag2vec returns a column vector of the elements along the diagonal.diag2vec(x)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.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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