删除R中的行和标识符

我有一个数据框，我想在其中删除特定的行，这样我就不会对它们进行报告，但我发现，即使删除了这些行，这些项在报告中也会显示为零值

例如，以下各项：

name <- c('a','b','c','d')
hight <- c('tall','short','tall','short')
df <- data.frame(name, hight)
summary(df$hight)

删除行后：

delRow<-which(df=='tall', arr.ind=T)[,1] 
df<-df[-delRow,]
summary(df$hight)

---

我如何才能完全摆脱“高”列？

summarydroplevelsdf$hightPerfect。谢谢你，韦伯

name <- c('a','b','c','d')
hight <- c('tall','short','tall','short')
df <- data.frame(name, hight)

df$hight <- as.character(df$hight)

delRow<-which(df=='tall', arr.ind=T)[,1] 
df<-df[-delRow,]
df$hight <- as.factor(df$hight)
summary(df$hight)

short  tall 
  2     0 

name <- c('a','b','c','d')
hight <- c('tall','short','tall','short')
df <- data.frame(name, hight)

df$hight <- as.character(df$hight)

delRow<-which(df=='tall', arr.ind=T)[,1] 
df<-df[-delRow,]
df$hight <- as.factor(df$hight)
summary(df$hight)

short 
    2