generalGraph-class {giRaph}R Documentation

Class "generalGraph"

Description

A class for general graphs.

Objects from the Class

Objects can be created by calls of the form new("generalGraph", ...). A generalGraph object consists of two slots, one for each possible representation: incidenceMatrix and incidenceList.

Slots

incidenceMatrix:
Object of class "incidenceMatrix"
incidenceList:
Object of class "incidenceList"

Extends

Class "anyGraph", directly, with explicit coerce.

Methods

initialize
signature(.Object="generalGraph"): constructs a general graph from one of the two possible representations
show
signature(object = "generalGraph"): displays the available representations of a general graph
display
signature(x = "generalGraph"): static graphical representation via package 'mathgraph'
dynamic.Graph
signature(object = "generalGraph"): dynamic graphical representation via package 'dynamicGraph'
incidenceList<-
signature(x = "generalGraph"): sets the incidence list representation
incidenceMatrix<-
signature(x = "generalGraph"): sets the incidence matrix representation
incidenceList
signature(object = "generalGraph"): gets the incidence list representation
incidenceMatrix
signature(object = "generalGraph"): gets the incidence matrix representation
names
signature(x = "generalGraph"): gets the character vertex identifiers of a general graph
names<-
signature(x = "generalGraph"): sets the character vertex identifiers of a general graph
card
signature(object = "generalGraph"): returns the number of vertices and the total number of edge occurrences in a general graph
isEmpty
signature(object = "generalGraph"): a graph object is empty if all its possible representations are empty
isPresent
signature(el = "edge", ou = "generalGraph"): an edge occurs in a graph object if it occurs in its non-empty slots
areTheSame
signature(x = "generalGraph", y = "generalGraph"): x and y are the same if their non-empty slots represent the same graph
[
signature(x = "generalGraph"): extracts an induced subgraph
[[
signature(x = "generalGraph"): extracts the character identifier of a vertex
coerce
signature(from = "anyGraph", to = "generalGraph"): all but directed and undirected edges are lost in the conversion
coerce
signature(from = "multiGraph", to = "generalGraph"): no edges are lost in the conversion as every multi-graph is a general graph
coerce
signature(from = "simpleGraph", to = "generalGraph"): no edges are lost in the conversion as every simple-graph is a general graph
coerce
signature(from = "generalGraph", to = "dg.graph"): conversion to class 'dg.graph' of package 'dynamicGraph'
+
signature(e1 = "generalGraph", e2 = "vertexSet"): adds a vertex set to a general graph by making the new vertices isolated
-
signature(e1 = "generalGraph", e2 = "vertexSet"): removes a vertex set from a general graph by dropping all edges involving the vertex set
+
signature(e1 = "generalGraph", e2 = "edge"): adds an edge to a general graph
-
signature(e1 = "generalGraph", e2 = "edge"): removes an edge from a general graph
*
signature(e1 = "generalGraph", e2 = "vertexSet"): restricts a general graph to a vertex set by dropping all edges involving vertices outside the vertex set

Note

Graphical representation via package 'dynamicGraph' is based on coercion to class dg.graph. Coercion to class dg.graph is obtained by expanding hyper edges to sets of ordinary edges, and using dashed lines for these. Graphical representation via package 'mathgraph' is obtained by means of coercion to class simpleGraph.

Author(s)

Jens Henrik Badsberg, Claus Dethlefsen, Luca La Rocca

See Also

incidenceMatrix-class and incidenceMatrix


[Package giRaph version 0.1-1 Index]