EffInd {NetIndices} | R Documentation |
Effective measures (or roles) suite: weighted measures for networks
Description
Calculates 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 |
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 |
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 <karline.soetaert@nioz.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.
Kones, J.K., Soetaert, K., van Oevelen, D. and J.Owino (2009). Are network indices robust indicators of food web functioning? a Monte Carlo approach. Ecological Modelling, 220, 370-382.
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"))
)