Class dg.VertexEdge

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Description

The class for edges between vertices.

Details

Edges are not constrained to have two vertices.

Objects from the Class

Objects has the methods for extracting and setting the slots for edges, and the method for drawing the edge.

Slots

oriented:

Object of class "logical". If oriented is NA then the edge is drawn as an arrow if the vertices of the edge are in different blocks, oriented according to the strata of the blocks. If oriented is NA and the vertices of the edge are in the same block, then an undirected edge is drawn. If oriented is TRUE then an arrow is drawn from the first vertex of the edge to the second. If oriented is FALSE then an undirected edge is drawn, also between blocks.

vertex.indices:

Object of class "numeric", see "dg.Edge". These are the indices of the vertices in the list of vertices.

width:

Object of class "numeric", see "dg.Edge".

dash:

Object of class "character", see "dg.Edge".

color:

Object of class "character", see "dg.Edge".

label:

Object of class "character", see "dg.Edge".

label.position:

Object of class "numeric", see "dg.Edge".

Extends

Class "dg.Edge", directly. Class "dg.Node", directly.

Methods

nodeTypesOfEdge

signature(object = "dg.VertexEdge"): ...

oriented<-

signature(x = "dg.VertexEdge"): ...

oriented

signature(object = "dg.VertexEdge"): ...

propertyDialog

signature(object = "dg.VertexEdge"): ...

Note

The dg.Edge class has beside the methods of dg.Vertex the methods oriented and oriented<-.

The method nodeIndicesOfEdge will extract the indices of the vertices of the edge, and the method nodeTypesOfEdge will extract the types ("super classes": vertex, factor or block) of the vertices (nodes) of an edge. The method draw is used to draw the edge, and items are added to the pop up menu of an edge by the method addToPopups.

Some of these methods also applies for block edges (dg.BlockEdge) and factor edges (dg.FactorEdge).

Author(s)

Jens Henrik Badsberg

See Also

newVertexEdge, returnEdgeList, dg.Edge-class.

Examples

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vertices <- returnVertexList(paste("V", 1:4, sep = ""))
e <- new("dg.VertexEdge", vertex.indices = c(1, 2, 3), 
         vertices = new("dg.VertexList", vertices[1:3]))

str(e)

color(e)
label(e)
labelPosition(e)
width(e)
oriented(e)
nodeIndicesOfEdge(e)
nodeTypesOfEdge(e)

color(e) <- "Black"
label(e) <- "1-2"
labelPosition(e) <- c(10, 20, 30)
width(e) <- 1
oriented(e) <- TRUE
nodeIndicesOfEdge(e) <- c(1, 2)

str(e)

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