拆分列与tidyr与不同的长度

Question

我想用tidyr分隔一列来提取年级。专栏看起来像这样：

School.Name
School A ES
SchoolB MS

这不是学校命名的标准方式，所以当我使用单独的

时

separate(DF, School.Name,c("School.Name","Number","Grade Level")

我明白了

School.Name  Number   Grade Level
School           A         ES
SchoolB         MS         NA

有没有办法告诉tidyr从右边读取而不是从左边读取

Answer 1

尝试?separate：

separate(DF, School.name, c("School.Name","Number","Grade Level"), fill = "left")

然后你得到的结果如下：

  School.Name  Number Grade Level
1      school       A          ES
2        <NA> schoolB          MS

修改

参数fill控制何时分隔的字符大小与列大小不匹配，可选warn, right, left.

1. 案例1：分隔的字符大小<列大小

e.g。

"schoolB MS" to C("A", "B", "C"), fill = "left" : <NA> schoolB MS


"schoolB MS" to C("A", "B", "C"), fill = "right" : schoolB MS <NA>

1. 案例2：分隔的字符大小>列大小

e.g。

"schoolB MS" to C("A"), fill = "warn" : schoolB #default drop extra from the right