R 分散成多个列

我得到了一个data.frame，我想像dplyr的扩展函数一样扩展它，但是有多个变量

Code    Product 2008    2008_Unit   2015    2015_Unit   Type
010110  Pure-bred breeding horses and asses 1   Tons    NA  NA  Exports_Peru_US
010110  Pure-bred breeding horses and asses 6   Tons    NA  NA  Exports_Peru_World
010110  Pure-bred breeding horses and asses 55  Units   NA  NA  Exports_US_Peru
010110  Pure-bred breeding horses and asses 3899    Units   NA  NA  Exports_US_World
010110  Pure-bred breeding horses and asses 0   No quantity 6   Tons    Exports_World
010110  Pure-bred breeding horses and asses 31  Tons    NA  NA  Imports_Peru_US

我想把它变成：

Code    Product 2008_Exports_Peru_US    2008_Unit_Exports_Peru_US   2015_Exports_Peru_US    2015_Unit_Exports_Peru_US   2008_Exports_Peru_World ...
010110  Pure-bred breeding horses and asses 1   Tons    NA  NA  6   ...

因此，每个代码只显示在一行中

注意：并非所有代码都具有所有类型

---

重塑2+data.table有效

dcast(setDT(master), Code + Product ~ Type, value.var = c("2008","2008_Unit", "2015", "2015_Unit"))

master <- the data frame
dcast(setDT(master), Code + Product ~ Type, value.var = c("2008","2008_Unit", "2015", "2015_Unit"))

---

重塑2+data.table有效

dcast(setDT(master), Code + Product ~ Type, value.var = c("2008","2008_Unit", "2015", "2015_Unit"))

master <- the data frame
dcast(setDT(master), Code + Product ~ Type, value.var = c("2008","2008_Unit", "2015", "2015_Unit"))

---

master您是否从
dplyr
尝试了
spread
？我有@Aramis7d的可能重复，通过使用多个spread，我仍然会得到相同代码id的倍数。无法使用一个，因为spread只需要1个参数，我有4列需要分散。我也尝试过dcast，但没有成功（尽管可能是因为我对整形2软件包缺乏经验）。需要data.table和整形2才能正常工作。问题解决了。