CODEWITHSUNDEEP
rdataframefunctionvector
Azamat Sadikov
Azamat Sadikov

Reputation: 11

problem with creating new columns inside a data frame by using function

I have this dataframe

a <- data.frame(b = c(1,2,3,4,5,6),
                d = c(2,4,6,8,10,12))

I want to make a make another row f which would be (d-b). How can I do this using a fucntion? I tried

new_a <- function(data, col1, col2){
  data$f <- data$col2 - data$col1
  return(data)
}

which gave " Error in $<-.data.frame(*tmp*, c, value = integer(0)) : replacement has 0 rows, data has 5 "

I also tried

  new_a = function(data, col1, col2) {
    data$f = data[col1] - data[col2]
    return(data)
  }

but this table wont name the new row as "f"

Would appreciate the help.

Upvotes: 0

Views: 29

Answers (1)

Wasim Aftab
Wasim Aftab

Reputation: 808

In your data frame, if there are no columns named col1 and col2, you will get that error. Using your example and changing your new_a function worked as follows,

new_a <- function(data){
  data$f <- data$d - data$b
  return(data)
}

Upvotes: 1

Related Questions