Question

我有几个具有相同结构的表（特别是两个例子）。我想加入ID_Position＆amp; ID_Name并在输出表中生成1月和2月的总和（两列中可能有一些NA）

ID_Position<-c(1,2,3,4,5,6,7,8,9,10)
Position<-c("A","B","C","D","E","H","I","J","X","W")
ID_Name<-c(11,12,13,14,15,16,17,18,19,20)
Name<-c("Michael","Tobi","Chris","Hans","Likas","Martin","Seba","Li","Sha","Susi")
  jan<-c(10,20,30,22,23,2,22,24,26,28)
  feb<-c(10,30,20,12,NA,3,NA,22,24,26)

df1 <- data.frame(ID_Position,Position,ID_Name,Name,jan,feb)


ID_Position<-c(1,2,3,4,5,6,7,8,9,10)
Position<-c("A","B","C","D","E","H","I","J","X","W")
ID_Name<-c(11,12,13,14,15,16,17,18,19,20)
 Name<-c("Michael","Tobi","Chris","Hans","Likas","Martin","Seba","Li","Sha","Susi")
  jan<-c(10,20,30,22,NA,NA,22,24,26,28)
  feb<-c(10,30,20,12,23,3,3,22,24,26)

  df2 <- data.frame(ID_Position,Position,ID_Name,Name,jan,feb)

我尝试了内部和完整的连接。但这似乎符合我的要求：

   library(plyr)

    test<-join(df1, df2, by =c("ID_Position","ID_Name") , type = "inner", match = "all")

期望的输出：

  ID_Position   Position    ID_Name       Name         jan  feb
      1            A          11          Michael        20 20
      2            B          12          Tobi           40 60
      3            C          13          Chris          60 40
      4            D          14          Hans           44 24
      5            E          15          Likas          23 23
      6            H          16          Martin         2  6
      7            I          17          Seba           44 22
      8            J          18          Li             48 44
      9            X          19          Sha            52 48
     10            W          20          Susi           56 52

Answer 1

您想要的输出似乎并不完全正确，但这里有一个示例说明如何使用data.table二进制连接有效地执行此操作，这允许您在使用加入时有效地运行函数by = .EACHI选项

library(data.table) setkey(setDT(df1), ID_Position, ID_Name, Name) setkey(setDT(df2), ID_Position, ID_Name, Name) df2[df1, .(jan = sum(jan, i.jan, na.rm = TRUE), feb = sum(feb, i.feb, na.rm = TRUE)), by = .EACHI] # ID_Position ID_Name Name jan feb # 1: 1 11 Michael 20 20 # 2: 2 12 Tobi 40 60 # 3: 3 13 Chris 60 40 # 4: 4 14 Hans 44 24 # 5: 5 15 Likas 46 0 # 6: 6 16 Martin 0 6 # 7: 7 17 Seba 44 0 # 8: 8 18 Li 48 44 # 9: 9 19 Sha 52 48 # 10: 10 20 Susi 56 52

如何连接表并生成列的总和？

1 个答案: