Class "pEdge": A class to represent an edge

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Description

This class is used to represent all necessary information to plot an edge in Graphviz

Details

The attrs slot is a named list, where the names correspond to attributes and the values in the list correspond to the value for that element's attribute.

The subG slot describes which subgraph this edge is a part of. A value of 0 implies that the edge is not a member of any subgraph.

Objects from the Class

Objects can be created by calls of the form new("pEdge", ...).

Slots

from:

Object of class "character": The name of the node on the tail of this edge.

to:

Object of class "character": The name of the node on the head of this edge.

attrs:

Object of class "list": A list of attributes specific to this edge.

subG:

Object of class "integer": Which subgraph this edge is a part of.

Methods

from

signature(object = "pEdge"): Retrieves the from slot of this edge

to

signature(object = "pEdge"): Retrieves the to slot of this edge

Author(s)

R. Gentleman and Jeff Gentry

See Also

pNode, agopen, buildEdgeList

Examples

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   set.seed(123)
   V <- letters[1:10]
   M <- 1:4
   g1 <- randomGraph(V, M, .2)

   z <- buildEdgeList(g1)
   vv <- z[[1]]   ## Object of type pEdge

   vv
   from(vv)
   to(vv)

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