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

[Rui Barradas]

Ouch!

Rui Barradas

Em 09-07-2012 21:39, peter dalgaard escreveu:
>
> On Jul 9, 2012, at 21:26 , Rui Barradas wrote:
>
>> 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])
>>
>
> Got to be easier to split(dat[-1], dat[[1]]), no?
>
> -pd
>
>>
>> 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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>>> Sent from the R help mailing list archive at Nabble.com.
>>>
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>>
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>