How to count unique values from vector?

Asked Sep 05 '17 at 11:57

Active Sep 05 '17 at 11:59

Viewed 77 times

I have:

c(17,20,30,12,30,20,17,20)

I want:

data.frame(c(1,2,3,2),c(12,17,20,30))

So unique values for the first vector shall be counted and sorted. the number of the counting should be in the first array.

edited Sep 05 '17 at 11:59

David Arenburg

asked Sep 05 '17 at 11:57

Matthias

1

`as.data.frame(table(x))` – Sotos Sep 05 '17 at 11:58
Since the counts are needed in the first column, a tweak to @Sotos' solution: `rev(as.data.frame(table(x)))` – Dan Sep 05 '17 at 12:07

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