Modify Data of a Data Frame with an Expression in R Programming – with() Function
with() function in R Language is used to modify data of a data frame by evaluating an expression within the arguments of the function.
Syntax: with(x, expr)
Parameters:
x: Data frame
expr: Expression to modify data
Example 1:
# R program to modify data of an object # Calling predefined data setBOD # Calling with() functionwith(BOD, {BOD$demand <- BOD$demand + 1; print(BOD$demand)}) |
Output:
Time demand 1 1 8.3 2 2 10.3 3 3 19.0 4 4 16.0 5 5 15.6 6 7 19.8 [1] 9.3 11.3 20.0 17.0 16.6 20.8
Example 2:
# R program to modify data of an object # Creating a data framedf = data.frame( "Name" = c("abc", "def", "ghi"), "Language" = c("R", "Python", "Java"), "Age" = c(22, 25, 45) ) df # Calling with() functionwith(df, {df$Age <- df$Age + 10; print(df$Age)}) |
Output:
Name Language Age 1 abc R 22 2 def Python 25 3 ghi Java 45 [1] 32 35 55
