R: Nestedness matrix

incmatrix {prabclus} | R Documentation

## Nestedness matrix

### Description

Computes species*species nestedness matrix and number of nestings (inclusions) from regions*species presence-absence matrix.

### Usage

    incmatrix(regmat)

### Arguments

`regmat` | 0-1-matrix. Columns are species, rows are regions.

### Value

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).

### Author(s)

Christian Hennig chrish@stats.ucl.ac.uk http://www.homepages.ucl.ac.uk/~ucakche

### References

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.

### See Also

`prabtest`

### Examples

    data(kykladspecreg)
    incmatrix(t(kykladspecreg))$ninc

[Package prabclus version 2.2-6 Index]