On 17-Nov-09 22:55:32, Marc Giombetti wrote:
> 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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E-Mail: (Ted Harding) <ted.hard...@manchester.ac.uk>
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Date: 17-Nov-09 Time: 23:26:25
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