Does R have a Set data structure?

Question

I am a beginner R learner, so bear with me if I say something incoherent.

I have a large vector variable holding exactly 5000 elements, and would like to know what these are, knowing that there are several repetitions. An introduction to R doesn't seem to say anything besides basic data structures, and I don't know if R offers this feature as built-in.

If there is no such "data structure", is there some built-in function to filter out repeated elements in a vector or list?

Answer 1

To remove multiple occurrences of a value within a vector use duplicated()

an example would be

x <- c(1,2,3,3,4,5,5,6)
x[!duplicated(x)]
# [1] 1 2 3 4 5 6

This is returning all values of x which are not (!) duplicated.

This will also work for more complex data structures like data.frames. See ?duplicated for further information.

unique(x) provides all values occurring in the vector.

table(x) shows the unqiue values and their number of occurrences in vector x

table(x)
# x
# 1 2 3 4 5 6 
# 1 1 2 1 2 1 

Answer 2

unique() function will work.

unique("name of vector")