Feel free to send your data to me, off list. I'll take a look at what might be going on inside vegan.

Gavin

Sent from my HTC

----- Reply message -----
From: "Duarte Viana" <viana.sptd@gmail.com>
Date: Mon, Jun 11, 2012 20:47
Subject: [R-sig-eco] error message with function rda of package vegan
To: "Sarah Goslee" <sarah.goslee@gmail.com>
Cc: "r-sig-ecology@r-project.org" <r-sig-ecology@r-project.org>

Hi,

Thank you for your reply. It's not easy to give you a reproducible
example, because this is a very specific case (something in my data ,
I believe). The only way is to send the data and try yourself. If
someone is willing to do that, I would be grateful.

I can send the response matrix and the explanatory matrix, and all one
has to do is load library vegan, load the data, and run the rda
function:

library(vegan)

resp<-read.table("resp.txt", head=F, sep="\t")
expl<-read.table("expl.txt", head=F, sep="\t")

myrda<-rda(resp, expl)

Thanks,

Duarte



On Mon, Jun 11, 2012 at 6:42 PM, Sarah Goslee <sarah.goslee@gmail.com> wrote:
> Hi,
>
> On Mon, Jun 11, 2012 at 12:35 PM, Duarte Viana <viana.sptd@gmail.com> wrote:
>> Hello all,
>>
>> Apologies for cross postings.
>>
>> I am running the function "rda" of the vegan library, like I did many
>> times without having troubles, and I get the following error message:
>> "Error in if (rank) { : argument is not interpretable as logical".
>>
>> I am just testing a response matrix against a single explanatory
>> matrix, which is the result of a model matrix with 4 dummy variables
>> (coding for a factor of 5 levels).
>>
>> myrda<-rda(resp, expl)
>>
>> When I, for instance, change the response matrix, it goes well.
>>
>> Does anyone know what might be happening?
>
> Not without a reproducible example, I'm afraid.
>
> Sarah
>
> --
> Sarah Goslee
> http://www.functionaldiversity.org

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