reconcile.activity: Modify the activity spells of vertices to match incident...

In networkDynamic: Dynamic Extensions for Network Objects

Modify the activity spells of vertices to match incident edges or the other way around

Description

When networkDynamic objects are created from real-world data it is often the case that activity information for vertices and edges may not come from the same source and may not match up exactly. Vertices may be inactive when incident edges are active, etc. The reconcile.vertex.activity function modifies the activity of a network's vertices acording to the mode specified, while reconcile.edge.activity performs similar operations for edges.

Usage

reconcile.vertex.activity(net,
                      mode = c ("expand.to.edges", "match.to.edges", "encompass.edges"),
                      edge.active.default = TRUE)

reconcile.edge.activity(net, 
                     mode = c("match.to.vertices", "reduce.to.vertices"), 
                     active.default = TRUE)

Arguments

net	a networkDynamic object
mode	string indicating the method for reconciling
edge.active.default	boolean, should edges with no definied activity be considered active?
active.default	boolean, should vertices with no definied activity be considered active?

Details

The mode argument takes the following values:

• match.to.edges vertices will be modified so as to be only active when incident edges are active. Existing vertex spells are deleted.

• expand.to.edges vertices activity will be expanded to include the activity periods of any incident edges (still permits isolated vertices). Existing vertex spells are preserved.

• encompass.edges vertices activity will be modified so that it has a single spell beginning with the earliest incident edge activity, and encompasses the last edge activity. (Note that this implies that isolated vertices will become inactive).

• match.to.vertices edges will be modified so as to be active whenever all incident vertices are active. Existing inactive edges will be activated if necessary.

• reduce.to.vertices edges will be modified so as to have no active spells when incident vertices are inactive. Inactive edges will not be activated.

Value

The input networkDynamic object is modified in place and returned invisibly.

Author(s)

skyebend, lxwang

Examples

nd<-network.initialize(6)
add.edges.active(nd,tail=1:3,head=2:4,onset=1,terminus=3)
add.edges.active(nd,tail=4,head=1,onset=5,terminus=7)
add.edge(nd,tail=1,head=6)
# before
get.vertex.activity(nd,as.spellList=TRUE)
reconcile.vertex.activity(nd)
# after
get.vertex.activity(nd,as.spellList=TRUE)

# induce edge activity for known vertex timing
nd<-network.initialize(4,directed=FALSE)
activate.vertices(nd,onset=1:4,terminus=3:6)
nd[,]<-1
get.edge.activity(nd,as.spellList=TRUE)
reconcile.edge.activity(nd, mode="reduce.to.vertices")
get.edge.activity(nd,as.spellList=TRUE)

networkDynamic documentation built on May 29, 2024, 1:16 a.m.