class関数を使う。おなじみ組み込みデータフレームのirisさんで確認。
> class(iris$Species)
[1] "factor"
全項目を一度に確認。sapply関数を使う。
> sapply(iris, class)
Sepal.Length Sepal.Width Petal.Length Petal.Width Species
"numeric" "numeric" "numeric" "numeric" "factor"
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