number of shared species between sites (VEGAN or RICH?)

Hello,

So you want to split data.frame 'dat' by the values of the first column, named 'site', and return the other columns.


lapply(split(dat, dat[[ 1 ]]), function(x) x[-1])

Hope this helps,

Rui Barradas

Em 09-07-2012 13:27, elpape escreveu:

Dear all

I'm trying to calculate the number of shared species between sites.

I have a dataframe with in the first column the names of the sites; the
names of the other columns are the species names. To use the shared function
from the package RICH one needs to input different matrices. So actually, I
want to split the dataframe per row so that each row becomes a separate
matrix and then perform the shared function. I used split(dataframe,
site_name), which splits the dataframe, but I cannot call the separate
matrices to calculate the number of shared species..

Does anyone know a way to do this? Or does somebody know a better way of
determining this?

Thanks!
Ellen

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