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Computes species*species nestedness matrix and number of nestings (inclusions) from regions*species presence-absence matrix.
incmatrix(regmat)
A list with components
0-1-matrix. m[i,j]=1 means that the occupied region of species j is a subset (not equal) of the region of species i.
m[i,j]=1
integer. Number of strict inclusions.
integer. Number of region equalities between species (not including equality between species i and i).
0-1-matrix. Columns are species, rows are regions.
Christian Hennig christian.hennig@unibo.it https://www.unibo.it/sitoweb/christian.hennig/en
Hausdorf, B. and Hennig, C. (2003) Nestedness of nerth-west European land snail ranges as a consequence of differential immigration from Pleistocene glacial refuges. Oecologia 135, 102-109.
prabtest
data(kykladspecreg) incmatrix(t(kykladspecreg))$ninc
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