如何删除数据框中的行? [英] How do I delete rows in a data frame?

问题描述

我有一个名为mydata"的数据框，如下所示:

I have a data frame named "mydata" that looks like this this:

   A  B  C   D 
1. 5  4  4   4 
2. 5  4  4   4 
3. 5  4  4   4 
4. 5  4  4   4 
5. 5  4  4   4 
6. 5  4  4   4 
7. 5  4  4   4 

我想删除第 2、4、6 行.例如，像这样:

I'd like to delete row 2,4,6. For example, like this:

   A  B  C   D
1. 5  4  4  4 
3. 5  4  4  4 
5. 5  4  4  4 
7. 5  4  4  4 

推荐答案

关键思想是形成一组要删除的行，并保留该组的补充.

The key idea is you form a set of the rows you want to remove, and keep the complement of that set.

在 R 中，集合的补码由-"运算符给出.

In R, the complement of a set is given by the '-' operator.

所以，假设 data.frame 被称为 myData:

So, assuming the data.frame is called myData:

myData[-c(2, 4, 6), ]   # notice the -

当然，如果您想完全删除这些行，请不要忘记重新分配"myData ---否则，R 只会打印结果.

Of course, don't forget to "reassign" myData if you wanted to drop those rows entirely---otherwise, R just prints the results.

myData <- myData[-c(2, 4, 6), ]

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