Partial grouping inside a dataframe in R

For statistical analysis purpose, I would like to regroup some rows inside a data frame based on their values.

What I have:

The desired output would be, for example, to regroup every latitude above 66 (66+67+68) in a single category 66+ and the desired output would be like this:

I do not want to use an if loop because I feel that it is not really R friendly.
I would also like to keep the initial column, that way I can try different combinations later on.

Thank you very much.

>Solution :

Option mutate and ifelse:

library(dplyr)
df %>%
  mutate(new = ifelse(latitude >= 66, "66+", latitude))

Output:

  number latitude new
1     30       57  57
2     12       59  59
3     01       68 66+
4     12       66 66+
5    101       55  55
6     47       61  61
7     05       60  60
8    288       67 66+

Data

df <- data.frame(number = c("30","12","01","12","101","47","05","288"),
                 latitude = c(57,59,68,66,55,61,60,67))