R subset()

1 개요

R subset()

• SQL의 'SELECT ~ WHERE ~'와 비슷...

subset(iris, Sepal.Length > 7.5)
##     Sepal.Length Sepal.Width Petal.Length Petal.Width   Species
## 106          7.6         3.0          6.6         2.1 virginica
## 118          7.7         3.8          6.7         2.2 virginica
## 119          7.7         2.6          6.9         2.3 virginica
## 123          7.7         2.8          6.7         2.0 virginica
## 132          7.9         3.8          6.4         2.0 virginica
## 136          7.7         3.0          6.1         2.3 virginica

subset(iris, Sepal.Length > 7.5, select = c(Sepal.Length, Species))
##     Sepal.Length   Species
## 106          7.6 virginica
## 118          7.7 virginica
## 119          7.7 virginica
## 123          7.7 virginica
## 132          7.9 virginica
## 136          7.7 virginica

subset(iris, Sepal.Length > 7.5 & Sepal.Width <= 2.9)
##     Sepal.Length Sepal.Width Petal.Length Petal.Width   Species
## 119          7.7         2.6          6.9         2.3 virginica
## 123          7.7         2.8          6.7         2.0 virginica

2 같이 보기

• R 추출
• R transform()
• R droplevels()
• SQL WHERE
• 부분집합

3 참고

• https://www.rdocumentation.org/packages/base/versions/3.5.3/topics/subset