R help - Jul 2012 - number of shared species between sites (VEGAN or RICH?)

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

--
View this message in context:
http://r.789695.n4.nabble.com/number-of-shared-species-between-sites-VEGAN-or-RICH-tp4635843.html
Sent from the R help mailing list archive at Nabble.com.

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
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/number-of-shared-species-between-sites-VEGAN-or-RICH-tp4635843.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>