gakera - 9 months ago 33

R Question

Let's say I have

`v = rep(c(1,2, 2, 2), 25)`

Now, I want to count the number of times each unique value appears.

`unique(v)`

`> unique(v)`

[1] 1 2

I want something that gives me

`length(v[v==1])`

[1] 25

length(v[v==2])

[1] 75

but as a more general one-liner :) Something close (but not quite) like this:

`#<doesn't work right> length(v[v==unique(v)])`

Answer Source

Perhaps table is what you are after?

```
dummyData = rep(c(1,2, 2, 2), 25)
table(dummyData)
# dummyData
# 1 2
# 25 75
## or another presentation of the same data
as.data.frame(table(dummyData))
# dummyData Freq
# 1 1 25
# 2 2 75
```