null model for testing nestedness (v_coudrain@voila.fr)

Message: 3
Date: Tue, 24 Sep 2013 20:07:58 +0200 (CEST)
From:v_coudrain at voila.fr
To:r-sig-ecology at r-project.org
Subject: [R-sig-eco] null model for testing nestedness
Message-ID: <1121167144.286531380046078873.JavaMail.www at wwinf7125>
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Dear all,
I would like to implement a null model to test if nestedness of a matrix departs from chance. There is an example in package "bipartite" with the function "nullmodel":

obs <- unlist(networklevel(web, index="weighted NODF"))
nulls <- nullmodel(web, N=100, method=1)
null <- unlist(sapply(nulls , networklevel, index="weighted NODF"))

This works well, however, I have the impress that prior to apply the function "networklevel", the initial matrix is being reordered to achieve maximal packing.
However, I don't want my matrix to be reordered, but I did not manage to find how to specify it. In the package vegan, there is the function nestednodf with the
option "order=FALSE", but I could not implement a null model based on this function (because the output contain multiple attributes).

Any help welcomed