R rowMeans()

1 개요

R rowMeans()

• Form Row Means
• "행별 평균", "가로 평균"

2 모든 열의 평균

df <- read.table( header=TRUE, stringsAsFactors=FALSE, text="
english math science
30      60   45
40      70   60
50      80   80
60      90   90
70      90   90
")
df

rowMeans(df)

apply(df, 1, mean)

df$mean <- rowMeans(df)
df

df$mean <- apply(df, 1, mean)
df

3 일부 열의 평균

df <- read.table( header=TRUE, stringsAsFactors=FALSE, text="
id english math science
1  30      60   45
2  40      70   60
3  50      80   80
4  60      90   90
5  70      90   90
")
df

df$mean <- rowMeans(df[,2:4])
df

df$mean <- apply(df[,2:4], 1, mean)
df

4 같이 보기

• R mean()
• R apply()
• R colMeans()
• R rowSums()

5 참고

• https://www.rdocumentation.org/packages/base/versions/3.6.1/topics/colSums