CODEWITHSUNDEEP
r
shiny
shiny

Reputation: 3502

Rename factor levels in a data.frame in R

I have this data.frame 

df <- data.frame(x = c("gravel", "sandstone", "siltstone"))

I want to rename the levels of the variable x by adding "R1_" before the name of the levels. I can do it following this answer. 

df %>%  dplyr::mutate(x = fct_recode(x, 
                                     "R1_gravel" = "gravel", 
                                     "R1_sandstone" = "sandstone",
                                     "R1_siltstone" = "siltstone" 
                                     ))

             x
1    R1_gravel
2 R1_sandstone
3 R1_siltstone

However, in my actual data.frame, variable x has many levels. So, it is time taking to rename all the levels as above. I wonder if there is a faster way to rename all the levels through adding R1_ at the start.

Upvotes: 4

Views: 4522

Answers (1)

user2100721
user2100721

Reputation: 3597

Do this

levels(df$x) <- paste0("R1_",levels(df$x))
# df
# x
# 1    R1_gravel
# 2 R1_sandstone
# 3 R1_siltstone

Upvotes: 3

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