Get categories from numeric vector

Question

I have this numeric vector:

vec <- 1:7

How can I transform it into 3 categories using these logical rules:

if(vec >=          


        

Answer 1

#a. `ifelse` approach

result<-ifelse(vec >= 1 & vec < 4,"category1",ifelse(vec >=4 & vec < 6,"category2","category3"))
[1] "category1" "category1" "category1" "category2" "category2" "category3" "category3"

#b. `Recode` from car package

library(car)
result<- Recode(vec,"1:3='category1';4:6='category2';else='category3'")
[1] "category1" "category1" "category1" "category2" "category2" "category2" "category3"

Answer 2

I'd recommend cut and its labels variable

cut(vec, c(1, 3, 5, 8), include.lowest = TRUE, labels = paste0("category", 1:3))
# [1] category1 category1 category1 category2 category2 category3 category3
# Levels: category1 category2 category3