R sapply()

1 개요

R sapply()

x <- c(2,3,4)
x

sapply(x, function(n) { n*n }) ## [1]  4  9 16

x**2 ## [1]  4  9 16

movies <- c("SPYDERMAN","BATMAN","VERTIGO","CHINATOWN")
sapply(movies, tolower)

sapply(movies, nchar)

df <- read.table( header=TRUE, stringsAsFactors=FALSE, text="
English Math
     90   60
     80   70
     70   80
     60   90
")
df

colMeans(df)

sapply(df, mean)

2 같이 보기

• R apply()
• R lapply()
• R colMeans()
• R apply() 패밀리
• 함수 map()

3 참고

• https://www.rdocumentation.org/packages/base/versions/3.6.0/topics/lapply