CODEWITHSUNDEEP
rdplyr
Paul Donadieu
Paul Donadieu

Reputation: 15

Formula inside Mutate and use of ~

Let's say I have a data frame df

df = data.frame(col1 = c(1:5),col2 = c(2:6))

I want to transform col1 by adding 10 to each value.

I have found several ways to do it for example using the recode function

df %>% mutate(col1 = recode(col1, "1" = "11", "2"="12", "3"="13", "4"="14", "5"="15"))

or using mutate(across()) function. df %>% mutate(across(col1, ~.x +10)

So here are my questions :

  1. What are the meanings of x and the . for ? I guess it means for every row of col1 take x and add 10 ?

  2. What could be an easier way to do this transformation ?

Thank you

Upvotes: 0

Views: 204

Answers (1)

Ronak Shah
Ronak Shah

Reputation: 389135

In this case, you don't need across since it is only for one column.

library(dplyr)

df %>% mutate(col1 = col1 + 10)

#  col1 col2
#1   11    2
#2   12    3
#3   13    4
#4   14    5
#5   15    6

Information about ~ and . can be found at What is meaning of first tilde in purrr::map , In map(), when is it necessary to use a tilde and a period. (~ and .) and Tilde and dots in R

Upvotes: 2

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