Basic question on nominal data

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Hello everybody,
I am new to R and I have a very basic question, but I couldn't get
this to work.
Let's say I have a vector

s = c("a","a","a","b","b","c","c","c","c")
s1 <- factor(s)

s2 <- summary(s1) leads to the following
a b c
3 2 4

How can I access the different aggregated values for a b and c? I am
not quite sure if the factor method is the right approach.
I tried to use s2$a but it didn't work.

Any suggestions?

Thanks a lot for your help
Marc

s2$a doesn't work because s2 is not a list. It is a vector.
You can find this out with

  str(s2)
  # Named int [1:3] 3 2 4
  # - attr(*, "names")= chr [1:3] "a" "b" "c"

so you can access its elements in the usual way; also by exploiting
its "names" attribute:

  s2[1]
  # a 
  # 3 
  s2["a"]
  # a 
  # 3 
  s2[2]
  # b 
  # 2 
  s2["b"]
  # b 
  # 2

etc.
Ted.

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Date: 17-Nov-09                                       Time: 23:26:25
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