# general matrix (nrow>1, ncol>1)
is_multidim(matrix(1:9, 3, 3)) # TRUE
# general data frame
is_multidim(iris) # TRUE
# vector
is_multidim(1:5) # FALSE
# factor
is_multidim(iris$Species) # FALSE
# one row matrix
is_multidim(matrix(1:5, 1, 5)) # FALSE
# one column matrix
is_multidim(matrix(1:5, 5, 1)) # FALSE
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