R 데이터프레임 컬럼명으로 컬럼 선택

1 개요[ | ]

R 데이터프레임 컬럼명으로 컬럼 선택

2 방법 1: subset()[ | ]

R

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0.3s

MEM

53M

0.3s

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df = iris
head(df)

  Sepal.Length Sepal.Width Petal.Length Petal.Width Species
1          5.1         3.5          1.4         0.2  setosa
2          4.9         3.0          1.4         0.2  setosa
3          4.7         3.2          1.3         0.2  setosa
4          4.6         3.1          1.5         0.2  setosa
5          5.0         3.6          1.4         0.2  setosa
6          5.4         3.9          1.7         0.4  setosa

R

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df = iris
df2 = subset(df, select=Petal.Length)
head(df2)

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R

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df = iris
df2 = subset(df, select=c(Petal.Length))
head(df2)

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R

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df = iris
df2 = subset(df, select=c(Petal.Length, Petal.Width))
head(df2)

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3 방법 2: names()[ | ]

R

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df = iris
head(df)

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R

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df = iris
df2 = df[(names(df) %in% c("Petal.Length","Petal.Width"))]
head(df2)

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4 같이 보기[ | ]