Re: [問題] 想連續處理多個column by factor

[celestialgod (攸藍)]

最簡單的方式就是用list去處理，範例code如下：
Product = "Product1" #可自行輸入產品編號
Month = "July" #可指定月份
data.l = lapply(1:10, function(k){
   eval(parse(text=paste("read.csv(\"D:/year", k, ".csv\")", sep="")))
   }
)
output.l = lapply(data.l, function(ll){
   eval(parse(text=paste("subset(ll, ", "Month==\"", Month, "\", select = ",
     Product, ")", sep="")))
   }
)
output.fr = Reduce(data.frame, output.l)

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※ 編輯: celestialgod    來自: 140.116.152.220      (10/24 18:51)
推 peiwinds:THX A LOT