How to remove dollar sign from a column of a data.table object in R?

To remove dollar sign in data.table object in R, we can follow the below steps −

• First of all, create a data.table object.

• Then, use gsub function along with lapply function to remove dollar sign.

Example

Create the data.table object

Let’s create a data.table object as shown below −

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

Output

On executing, the above script generates the below output(this output will vary on your system due to randomization) −

  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

Remove dollar sign

Using gsub function along with lapply function to remove dollar sign from Sale_Price column as shown below −

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

Output

  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