根据R中的行号向量从数据帧中提取值 [英] extract values from a data frame based on a vector of row numbers in R

问题描述

我正在尝试根据行号矢量从数据帧中提取值矢量；

I am trying to extract a vector of values from a data frame based on a vector of row numbers;

df<-iris
x<-c(1,5,15,8,7,2)

我想要向量x中列出的行号的相应Species.我尝试了类似 df $ Species [x，] 和 df $ Species [list(x)，] 之类的方法，但无济于事.我相信答案确实很简单，但我看不到！

I want the corresponding Species of the row numbers listed in the vector x. I have tried something like df$Species[x,] and df$Species[list(x),] to no avail. I am sure the answer is something really simple but I just can't see it!

预先感谢

推荐答案

尝试

df[x,]$Species

或

df[,"Species"][x]

或者实际上

df[x,"Species"]

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