EffInd {NetIndices}R Documentation

Effective measures (or roles) suite: weighted measures for networks

Description

Calulates effective connectivity, effective flows, effective nodes and effective roles of a network

Usage

EffInd(Flow=NULL, Tij=t(Flow), 
  Import=NULL, Export=NULL)

Arguments

Flow Network matrix with Flow[i,j] the flow from i (row) to j (column); component positions in rows and columns must be the same; if present, rownames or columnnames denote the compartment names
Tij Network matrix where connectance is from column j to row i; component positions in rows and columns must be the same ; if present, rownames or columnnames denote the compartment names
Import Vector with either the *indices* or the *names* of external compartmens from where flow enters the network; the indices point to the column positions in Tij (and the row positions in Flow)
Export Vector with either the *indices* or the *names* of external compartmens to where flow leaves the network; the indices point to the row positions in Tij (and the column positions in Flow)

Details

The mathematical formulation of these indices can be found in the package vignette - vignette("NetIndices").

The PDF can be found in the subdirectory ‘doc’ of the NetIndices package

Value

a list with the following items:

CZ Effective connectance
FZ Effective Flows
NZ Effective nodes
RZ Effective roles

Author(s)

Karline Soetaert <k.soetaert@nioo.knaw.nl>, Julius Kipyegon Kones<jkones@uonbi.ac.ke>

References

Latham LG. 2006. Network flow analysis algorithms. Ecological Modelling 192: 586-600.
Zorach and Ulanowicz, 2003. Quantifying the complexity of flow networks: how many roles are there?. Complexity 8,68-76.

Examples

# The takapoto atoll network
EffInd(Takapoto,Import ="CO2",
       Export=c("CO2","Sedimentation","Grazing"))

# Conesprings is the example set 1a from Latham 2006.
as.data.frame(EffInd(Tij=Conesprings,Import="Inflows",
    Export=c("Export","Dissipation")))

[Package NetIndices version 1.2 Index]