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   99
40      70   88
50      80   77
60      90   66
70      90   55
")
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   99
2  40      70   88
3  50      80   77
4  60      90   66
5  70      90   55
")
df
<syntaxhighlight lang='r'>

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

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