string – 由R中的组连接列

发布时间：2020-12-12 13:10:14 所属栏目：百科来源：网络整理

导读：假设我有这个员工名单： Dept Date Name ----- --------- --------------- 30 07-DEC-02 Raphaely 30 18-MAY-03 Khoo 40 07-JUN-02 Mavris 50 01-MAY-03 Kaufling 50 14-JUL-03 Ladwig 70 07-JUN-02 Baer 90 13-JAN-01 De Haan 90 17-JUN-03 King 100 16-AUG

假设我有这个员工名单：

Dept Date      Name            
----- --------- --------------- 
   30 07-DEC-02 Raphaely        
   30 18-MAY-03 Khoo            
   40 07-JUN-02 Mavris          
   50 01-MAY-03 Kaufling        
   50 14-JUL-03 Ladwig          
   70 07-JUN-02 Baer            
   90 13-JAN-01 De Haan
   90 17-JUN-03 King  
  100 16-AUG-02 Faviet
  100 17-AUG-02 Greenberg 
  110 07-JUN-02 Gietz           
  110 07-JUN-02 Higgins

我希望按照R部门(类似于Oracle PL/SQL’s LISTAGG function)的列表聚合来生成最后一列：

Dept Date      Name            Emp_list
----- --------- --------------- ---------------------------------------------
   30 07-DEC-02 Raphaely        Raphaely; Khoo
   30 18-MAY-03 Khoo            Raphaely; Khoo
   40 07-JUN-02 Mavris          Mavris
   50 01-MAY-03 Kaufling        Kaufling; Ladwig
   50 14-JUL-03 Ladwig          Kaufling; Ladwig
   70 07-JUN-02 Baer            Baer
   90 13-JAN-01 De Haan         De Haan; King
   90 17-JUN-03 King            De Haan; King
  100 16-AUG-02 Faviet          Faviet; Greenberg
  100 17-AUG-02 Greenberg       Faviet; Greenberg
  110 07-JUN-02 Gietz           Gietz; Higgins
  110 07-JUN-02 Higgins         Gietz; Higgins

任何建议？

你可以使用ave和paste：

within(mydf,{
  Emp_list <- ave(Name,Dept,FUN = function(x) paste(x,collapse = "; "))
})
#   Dept      Date      Name          Emp_list
# 1    30 07-DEC-02  Raphaely    Raphaely; Khoo
# 2    30 18-MAY-03      Khoo    Raphaely; Khoo
# 3    40 07-JUN-02    Mavris            Mavris
# 4    50 01-MAY-03  Kaufling  Kaufling; Ladwig
# 5    50 14-JUL-03    Ladwig  Kaufling; Ladwig
# 6    70 07-JUN-02      Baer              Baer
# 7    90 13-JAN-01   De Haan     De Haan; King
# 8    90 17-JUN-03      King     De Haan; King
# 9   100 16-AUG-02    Faviet Faviet; Greenberg
# 10  100 17-AUG-02 Greenberg Faviet; Greenberg
# 11  110 07-JUN-02     Gietz    Gietz; Higgins
# 12  110 07-JUN-02   Higgins    Gietz; Higgins

（编辑：李大同）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!