R語言定義數據框的行名和列名

假設有三組數據： > weight = c(150, 135, 210, 140) > height = c(65, 61, 70, 65) > gender = c("Fe","Fe","M","Fe") 據此，咱們可以獲得數據框study： > study = data.frame(weight,height,gender) > study   weight height gender 1 1

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