更新时间:2022-11-13 18:20:42
您总是可以尝试简单地将前两列传递给函数duplicated
:
You can always try simply passing those first two columns to the function duplicated
:
duplicated(dat[,1:2])
假设您的数据框名为 dat
.如需更多信息,我们可以通过在控制台输入 ?duplicated
来查阅 duplicated
功能的帮助文件.这将提供以下句子:
assuming your data frame is called dat
. For more information, we can consult the help files for the duplicated
function by typing ?duplicated
at the console. This will provide the following sentences:
确定向量或数据框的哪些元素是重复的具有较小下标的元素,并返回一个逻辑向量指示哪些元素(行)是重复的.
Determines which elements of a vector or data frame are duplicates of elements with smaller subscripts, and returns a logical vector indicating which elements (rows) are duplicates.
所以 duplicated
返回一个逻辑向量,然后我们可以使用它来提取 dat
的子集:
So duplicated
returns a logical vector, which we can then use to extract a subset of dat
:
ind <- duplicated(dat[,1:2])
dat[ind,]
或者您可以跳过单独的分配步骤并简单地使用:
or you can skip the separate assignment step and simply use:
dat[duplicated(dat[,1:2]),]