Extracting items which occur over n times in R

Question

Say I'm using R and have a data table:

x <- data.table(V1 = c("A","A","A","B","B","C","D"))    
table(x)

gives the following:

A B C D     
3 2 1 1

How do I extract the items which occur over n times? For example, the output should be "A" if n = 2, and "A" and "B" if n = 1, and "A", "B", "C" if n = 0.

Since you are using `data.table` `x[, V1[.N > 1], V1]$V1` – akrun Jun 20 '18 at 15:05 — akrun, Jun 20 '18 at 15:05
Or `x[, .N, V1][N>1, V1]` – R. Schifini Jun 20 '18 at 15:12 — R. Schifini, Jun 20 '18 at 15:12

score 0 · Answer 1 · answered Jun 20 '18 at 15:01

0

Use names(x)[x > n], where n is the desired number of times. For example, names(x)[x > 1] gives "A" "B"

answered Jun 20 '18 at 15:01

wwl

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Extracting items which occur over n times in R

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