Perfectly what I need. Thank you very much!
I will try the function and tell you the results,

Gian

2012/2/1 Roman Luštrik <roman.lustrik@gmail.com>

> vegan comes with a few vignettes, have a look at those. You can start with
> this one:
> http://cran.r-project.org/web/packages/vegan/vignettes/diversity-vegan.pdf
>
>
> From the vignette:
>
> R> data(dune)
> R> data(dune.taxon)
> R> taxdis <- taxa2dist(dune.taxon, varstep=TRUE)
> R> mod <- taxondive(dune, taxdis)
>
> First few lines of dune.taxon:
>
>                 Genus           Family          Order       Subclass
>  Class
> Belper         Bellis       Asteraceae      Asterales       Asterids
> Dicots
> Empnig       Empetrum      Empetraceae       Ericales       Asterids
> Dicots
> Junbuf         Juncus        Juncaceae       Juncales    Commelinids
> Monocots
> Junart         Juncus        Juncaceae       Juncales    Commelinids
> Monocots
> Airpra           Aira          Poaceae         Poales    Commelinids
> Monocots
>
> Have a look at dune.taxon. I hope that gets you started.
>
> Cheers,
> Roman
>
>
>
> 2012/2/1 Gian Maria Niccolò Benucci <gian.benucci@gmail.com>
>
>> Dear Members,
>>
>> I would try to use indices of taxonomic diversity and distinctness to
>> differentiate two mycorrhizal fungal communities. My problem is up to
>> the*dis
>>
>> * object required to the function for the calculation. In the function
>> help
>> I red that "function* taxa2dist* can produce a suitable dist object from a
>>
>> classification table". How should I should create this classification
>> table? How it should look-like?
>> Thank you very much in advance,
>>
>> Gian
>>
>> --
>> Gian Maria Niccolò Benucci, Ph.D.
>> Department of Applied Biology
>> University of Perugia
>> Borgo XX Giugno, 74
>> 06121 - Perugia, ITALY
>> Tel: +390755856433
>> Email: gian.benucci@gmail.com
>>
>>
>>
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>>
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>>
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>>
>
>
> --
> In God we trust, all others bring data.
>

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