"R 데이터프레임 컬럼명으로 컬럼 제거"의 두 판 사이의 차이

2021년 10월 27일 (수) 00:24 기준 최신판

df <- iris
head(df)

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

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

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

df <- iris
head(df)

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

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

@@ 2번째 줄: / 2번째 줄: @@
 ;R 데이터프레임 컬럼명으로 컬럼 제거
+==방법 1: subset()==
 <syntaxhighlight lang='r' run>
-df = read.table( header=TRUE, stringsAsFactors=FALSE, text="
+df <- iris
-Class Name  English Math
+head(df)
-A     Alice 90      60
+</syntaxhighlight>
-A       Bob 80      NA
+<syntaxhighlight lang='r' run>
-B     Carol NA      80
+df <- iris
-B      Dave 60      90
+df2 <- subset(df, select=-Petal.Length)
-")
+head(df2)
-options(echo=T)
+</syntaxhighlight>
-df[!(names(df) %in% c("Name","Math"))]
+<syntaxhighlight lang='r' run>
-df[,!(names(df) %in% c("Name","Math"))]
+df <- iris
+df2 <- subset(df, select=-c(Petal.Length))
+head(df2)
+</syntaxhighlight>
+<syntaxhighlight lang='r' run>
+df <- iris
+df2 <- subset(df, select=-c(Petal.Length, Petal.Width))
+head(df2)
+</syntaxhighlight>
+==방법 2: names()==
+<syntaxhighlight lang='r' run>
+df <- iris
+head(df)
+</syntaxhighlight>
+<syntaxhighlight lang='r' run>
+df <- iris
+df2 <- df[!(names(df) %in% c("Petal.Length", "Petal.Width"))]
+head(df2)
+</syntaxhighlight>
+<syntaxhighlight lang='r' run>
+df <- iris
+df2 <- df[,!(names(df) %in% c("Petal.Length", "Petal.Width"))]
+head(df2)
 </syntaxhighlight>
 ==같이 보기==
+* [[R %in%]]
+* [[R names()]]
+* [[R subset()]]
 * [[R 데이터프레임 컬럼 제거]]
 * [[R 데이터프레임 n번째 컬럼 제거]]
+* [[Pandas 컬럼명으로 컬럼 제거]]
 [[분류: R 데이터프레임]]