Hi
It is rather unclear how do you want sample your data. It seems to me that
you can sample row numbers and choose sampled rows from data frame.
I probably direct output to a list ("mylist") and use
result <- lapply("mylist", GFD)
Regards
Petr
r-help-boun...@r-project.org napsal dne 17.01.2011 16:31:59:
> Dear list i have a sample question
>
> I have a dataframe of 1500 species and 13 life history traits.
>
> small example code:
>
> traits <- data.frame(letters[1:9],
> sample(letters, 9),
> sample(letters, 9),
> sample(letters, 9),
> sample(letters, 9),
> sample(letters, 9),
> sample(letters, 9),
> sample(letters, 9),
> sample(letters, 9))
> colnames(traits) <- c("species", 1:8)
>
> What i want to do is:
>
> Sample a number of species from the data frame in integers of 50: - 50
> species, 100 species ,150,200... up-to 1500, when i sample them i also
want
> the traits associated with them to be kept intact. For each species
number i
> would like a 1000 repetitions. So i would like 50 species with their
life
> history traits randomly sampled 1000 times, then 100 species with their
life
> history traits sampled 1000 times. I appreciate that as i get to the
higher
> numbers i.e 1500 species this will only be sampled once, therefore i
will need
> to use replace = yes.
>
> Then i have a function i want to run on the sample so for the 50 species
i
> want to run a function which requires the name of the sample
>
> GFD(50species_sample1)
> GFD(50species_sample2) etc to
> GFD(50species_sample1000)
>
> Then
>
> GFD(100species_sample1)
>
> etc.
> With the reults put into a data-frame.
>
> I am relatively new to R, i could probably hack together a code but i am
> unsure how to join it up so i sample, retain the data and then use it in
a function?
>
> Any help would be greatly appreciated.
>
> I appreciate this is a lot to ask so any help would be greatly
appreciated.
>
> Thanks in advance,
>
> Chris
>
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