基于R中的行号向量从数据帧中提取值

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

我试图根据行号向量从数据帧中提取值向量;

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

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!

我想要向量x中列出的行号的相应种类。我尝试过像df $ Species [x，]和df $ Species [list（x），]这样的东西无济于事。我确信答案很简单，但我看不到它！

Thanks in advance

提前致谢

1 个解决方案

#1

Try

尝试

df[x,]$Species

or

要么

df[,"Species"][x]

or indeed

或者确实

df[x,"Species"]