Objects from the Class
Objects can be created by calls of the form new("incidenceMatrix", I).Slots
.Data:- Object of class
"matrix"; a column for each vertex and a row for each edge
Extends
Class "matrix", from data part.
Class "structure", by class "matrix".
Class "array", by class "matrix".
Class "vector", by class "matrix", with explicit coerce.Methods
- initialize
signature(.Object = "incidenceMatrix"):
constructs an incidence matrix representation of a general graph from a matrix of positive integers- show
signature(object = "incidenceMatrix"): displays an incidence matrix representation- names
signature(x = "incidenceMatrix"): gets the character vertex identifiers of an incidence matrix- names<-
signature(x = "incidenceMatrix"): sets the character vertex identifiers of an incidence matrix- card
signature(object = "incidenceMatrix"):
returns the number of vertices and the total number of edge occurrences in an incidence matrix- isEmpty
signature(object = "incidenceMatrix"): an incidence matrix is empty if it has no columns- areTheSame
signature(x = "incidenceMatrix", y = "incidenceMatrix"):
x and y are the same incidence matrix if they represent the same general graph- isPresent
signature(el = "undirectedEdge", ou = "incidenceMatrix"):
tells whether an undirected edge occurs in the graph represented by an incidence matrix- isPresent
signature(el = "directedEdge", ou = "incidenceMatrix"):
tells whether a directed edge occurs in the graph represented by an incidence matrix- [
signature(x = "incidenceList"): extracts the incidence matrix of an induced subgraph- [[
signature(x = "incidenceList"): extracts the character identifier of a vertex- coerce
signature(from = "incidenceList", to = "incidenceMatrix"):
converts an incidence list to an incidence matrix by dropping all but undirected and directed edges- coerce
signature(from = "adjacencyList", to = "incidenceMatrix"):
converts an adjacency list to an incidence matrix- coerce
signature(from = "adjacencyMatrix", to = "incidenceMatrix"):
converts and adjacency matrix to an incidence matrix- +
signature(e1 = "incidenceMatrix", e2 = "vertexSet"):
adds a vertex set to an incidence matrix by making the new vertices isolated- -
signature(e1 = "incidenceMatrix", e2 = "vertexSet"):
removes a vertex set from an incidence matrix by dropping all edges involving the vertex set- +
signature(e1 = "incidenceMatrix", e2 = "undirectedEdge"): adds an undirected edge to an incidence matrix- +
signature(e1 = "incidenceMatrix", e2 = "directedEdge"): adds a directed edge to an incidence matrix- -
signature(e1 = "incidenceMatrix", e2 = "undirectedEdge"):
removes an undirected edge from an incidence matrix- -
signature(e1 = "incidenceMatrix", e2 = "directedEdge"):
removes a directed edge from an incidence matrix- *
signature(e1 = "incidenceMatrix", e2 = "vertexSet"):
restricts an incidence matrix to a vertex set by dropping all edges involving vertices outside the vertex set
Warning
All zero input rows are discarded by the constructor.