EcoSimR (version 0.1.0)

sim1: Sim1 Co-occurrence Randomization Algorithm

Description

Randomizes a binary matrix speciesData by reshuffling all of its elements equiprobably.

Usage

sim1(speciesData)

Arguments

speciesData

binary presence-absence matrix (rows = species, columns = sites).

Value

Returns a binary presence-absence matrix with the same dimensions and percent fill as the input matrix.

Details

This algorithm assumes species and sites are equiprobable. It preserves the total matrix fill, but places no other constraints on row or column totals.

References

Gotelli, N.J. 2000. Null model analysis of species co-occurrence patterns. Ecology 81: 2606-2621.

Examples

randomMatrix <- sim1(speciesData=matrix(rbinom(40,1,0.5),nrow=8))