如何以降序从数据框中获取前n家公司 [英] How to get top n companies from a data frame in decreasing order

问题描述

我正在尝试从数据框中获得排名前n位的公司.以下是我的代码.

I am trying to get the top 'n' companies from a data frame.Here is my code below.

data("Forbes2000", package = "HSAUR")
sort(Forbes2000$profits,decreasing=TRUE)

现在我想从排序后的向量中获得前50个观察值.

Now I would like to get the top 50 observations from this sorted vector.

推荐答案

head和tail确实有用！

head(sort(Forbes2000$profits,decreasing=TRUE), n = 50)

如果要data.frame的前50行，则可以使用plyr中的arrange函数对data.frame进行排序，然后使用head

If you want the first 50 rows of the data.frame, then you can use the arrange function from plyr to sort the data.frame and then use head

library(plyr)

head(arrange(Forbes2000,desc(profits)), n = 50)

请注意，我在调用desc的过程中包装了profits，这意味着它将以降序排列.

Notice that I wrapped profits in a call to desc which means it will sort in decreasing order.

在没有工作的情况下工作

To work without plyr

head(Forbes2000[order(Forbes2000$profits, decreasing= T),], n = 50)

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