如何从 R 中的 data.table 对象的列中删除美元符号？
要删除data.tableR中的美元符号对象，我们可以按照以下步骤操作-
首先，创建一个data.table对象。
然后，使用gsub函数和lapply函数删除美元符号。
示例
创建data.table对象
让我们创建一个data.table对象，如下所示-
library(data.table)
Sale_Price<-sample(c("10 $","5 $","12 $","15 $","9 $"),25,replace=TRUE)
Product_Type<-sample(c("Digital","Physical"),25,replace=TRUE)
DT<-data.table(Product,Sale_Price)
DT输出结果执行时，上述脚本生成以下内容output(thisoutputwillvaryonyoursystemduetorandomization)-
Product Sale_Price 1: Milk 15 $ 2: Sugar 15 $ 3: Sugar 12 $ 4: Bread 12 $ 5: Milk 15 $ 6: Sugar 15 $ 7: Sugar 9 $ 8: Bread 10 $ 9: Bread 9 $ 10: Wheat 12 $ 11: Wheat 15 $ 12: Milk 9 $ 13: Wheat 10 $ 14: Wheat 12 $ 15: Milk 10 $ 16: Milk 10 $ 17: Milk 10 $ 18: Milk 10 $ 19: Sugar 5 $ 20: Milk 15 $ 21: Wheat 5 $ 22: Sugar 12 $ 23: Milk 9 $ 24: Wheat 9 $ 25: Bread 12 $ Product Sale_Price
删除美元符号
使用gsub函数和lapply函数从Sale_Price列中删除美元符号，如下所示-
library(data.table)
Sale_Price<-sample(c("10 $","5 $","12 $","15 $","9 $"),25,replace=TRUE)
Product_Type<-sample(c("Digital","Physical"),25,replace=TRUE)
DT<-data.table(Product,Sale_Price)
DT[]<-lapply(DT,gsub,pattern=" $",fixed=TRUE,replacement="")
DT输出结果Product Sale_Price 1: Milk 15 2: Sugar 15 3: Sugar 12 4: Bread 12 5: Milk 15 6: Sugar 15 7: Sugar 9 8: Bread 10 9: Bread 9 10: Wheat 12 11: Wheat 15 12: Milk 9 13: Wheat 10 14: Wheat 12 15: Milk 10 16: Milk 10 17: Milk 10 18: Milk 10 19: Sugar 5 20: Milk 15 21: Wheat 5 22: Sugar 12 23: Milk 9 24: Wheat 9 25: Bread 12 Product Sale_Price