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) returns what the unique values are, but not how many they are.
> unique(v)  1 2
I want something that gives me
length(v[v==1])  25 length(v[v==2])  75
but as a more general one-liner :) Something close (but not quite) like this:
#<doesn't work right> length(v[v==unique(v)])