跨数据帧乘以列值

Question

我希望将两个不同数据帧中的数据相乘。输入是动态的，因此每个团队的 ID 数量不是恒定的。我在下面包含了一组样本数据。

Branch  ID-1  Time-1  ID-2  Time-2  ID-3  Time-3
Texas   BKP   5.5     LMG   2.8     DDP   8.9
Maine   BQQ   11      BKP   8.1     OLW   3.0
NYork   DDP   2.0     ADD   6.5     BQQ   0.4

有数百个分支可以使用数千个 ID，因此下面只是我创建的一小部分。我们还收到所有 ID 的成本数据框，类似于以下内容：

ID     Cost
ADD    4.50
BKP    11.99
BQQ    1.50
DDP    8.99
LMG    24.99
OLW    29.99

我正在尝试按每个分支的 ID 查找成本，我可以按子字符串查找，但加入第二个数据帧是我运行遇到麻烦的地方。我需要的输出如下所示：

Branch  ID-1  Time-1  ID-2  Time-2  ID-3  Time-3  Cost-1  Cost-2  Cost-3
Texas   BKP   5.5     LMG   2.8     DDP   8.9     65.945  69.972  80.011
Maine   BQQ   11      BKP   8.1     OLW   3.0     16.50   97.119  89.97
NYork   DDP   2.0     ADD   6.5     BQQ   0.4     17.98   29.25   0.6

我知道这不是最漂亮的输出，但不幸的是这是需要的输出。非常感谢您为此提供的任何帮助。

Answer 1

data.table的可能解决方案：

library(data.table)

melt(setDT(df1), id = 1,
     measure.vars = patterns(c("^ID","^Time")),
     value.name = c("ID","Time")
     )[df2, on = .(ID), Cost := Time * i.Cost
       ][, dcast(.SD, Branch ~ variable, value.var = c("ID","Time","Cost"))]

给出：

   Branch ID_1 ID_2 ID_3 Time_1 Time_2 Time_3 Cost_1 Cost_2 Cost_3
1:  Maine  BQQ  BKP  OLW   11.0    8.1    3.0 16.500 97.119 89.970
2:  NYork  DDP  ADD  BQQ    2.0    6.5    0.4 17.980 29.250  0.600
3:  Texas  BKP  LMG  DDP    5.5    2.8    8.9 65.945 69.972 80.011

已用数据：

df1 <- structure(list(Branch = c("Texas", "Maine", "NYork"), ID.1 = c("BKP", "BQQ", "DDP"), Time.1 = c(5.5, 11, 2), 
                      ID.2 = c("LMG", "BKP", "ADD"), Time.2 = c(2.8, 8.1, 6.5), ID.3 = c("DDP", "OLW", "BQQ"), Time.3 = c(8.9, 3, 0.4)), 
                 .Names = c("Branch", "ID.1", "Time.1", "ID.2", "Time.2", "ID.3", "Time.3"), class = "data.frame", row.names = c(NA, -3L))
df2 <- structure(list(ID = c("ADD", "BKP", "BQQ", "DDP", "LMG", "OLW"), Cost = c(4.5, 11.99, 1.5, 8.99, 24.99, 29.99)),
                 .Names = c("ID", "Cost"), class = "data.frame", row.names = c(NA, -6L))

Answer 2

使用 Base R：

dat3 = merge(reshape(dat1,matrix(2:ncol(dat1),2),idv=1,dir="long",ids=dat1$Branch),dat2,by.x="ID.1",by.y="ID")

 reshape(transform(dat3,Cost=Cost * Time.1)[order(dat3$time),],idvar = "Branch",dir="wide")

  Branch ID.1.1 Time.1.1 Cost.1 ID.1.2 Time.1.2 Cost.2 ID.1.3 Time.1.3 Cost.3
2  Texas    BKP      5.5 65.945    LMG      2.8 69.972    DDP      8.9 80.011
4  Maine    BQQ     11.0 16.500    BKP      8.1 97.119    OLW      3.0 89.970
6  NYork    DDP      2.0 17.980    ADD      6.5 29.250    BQQ      0.4  0.600

跨数据帧乘以列值

Multiply across dataframes by column values

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