Binning a numeric variable

Question

I have a vector X that contains positive numbers that I want to bin/discretize. For this vector, I want the numbers [0, 10) to show up just as they exist in the vector, but

Answer 1

You question is inconsistent.
In description 10 belongs to "10+" group, but in code 10 is separated level. If 10 should be in the "10+" group then you code should be

as.factor(ifelse(x >= 10,"10+",x))

In this case you could truncate data to 10 (if you don't want a factor):

pmin(x, 10)
# [1]  0  1  3  4  2  4  2  5 10 10 10  2 10  2 10  3  4  2 10