incmatrix {prabclus} | R Documentation |
Computes species*species nestedness matrix and number of nestings (inclusions) from regions*species presence-absence matrix.
incmatrix(regmat)
regmat |
0-1-matrix. Columns are species, rows are regions. |
A list with components
m |
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. |
ninc |
integer. Number of strict inclusions. |
neq |
integer. Number of region equalities between species (not including equality between species i and i). |
Christian Hennig chrish@stats.ucl.ac.uk http://www.homepages.ucl.ac.uk/~ucakche
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.
data(kykladspecreg) # Note: If you do not use the installed package, replace this by # kykladspecreg <- read.table("(path/)kykladspecreg.dat") incmatrix(t(kykladspecreg))$ninc