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Check connectivity of a gGraph object

Source: R/connectivity.R
connectivity.Rd

The functions areNeighbours, areConnected and the method isConnected test connectivity in different ways.

Usage

areNeighbours(V1, V2, graph)

areConnected(x, nodes)

# S4 method for gData
isConnected(object, ...)

isReachable(x, loc)

connectivityPlot(x, ...)

# S4 method for gGraph
connectivityPlot(x, ..., seed = NULL)

# S4 method for gData
connectivityPlot(x, col.gGraph = 0, ..., seed = NULL)

Arguments

V1

a vector of node names

V2

a vector of node names

graph

a valid graphNEL object.

x

a valid gGraph object.

nodes

a vector of node names

object

a valid gData object.

...

other arguments passed to other methods.

loc

location, specified as a list of two components giving respectively the longitude and the latitude. Alternatively, it can be a matrix-like object with one row and two columns.

seed

an optional integer giving the seed to be used when randomizing colors. One given seed will always give the same set of colors. NULL by default, meaning colors are randomized each time a plot is drawn.

col.gGraph

a character string or a number indicating the color of the nodes to be used when plotting the gGraph object. Defaults to '0', meaning that nodes are invisible.

Value

  • areNeighbours: a vector of logical, having one value for each couple of nodes.

  • areConnected: a single logical value, being TRUE if nodes form a connected set.

  • isConnected: a single logical value, being TRUE if nodes of the object form a connected set.

Details

  • areNeighbours: tests connectivity between couples of nodes on an object inheriting graph class (like a graphNEL object).

  • areConnected: tests if a set of nodes form a connected set on a gGraph object.

  • isConnected: tests if the nodes of a gData object form a connected set. Note that this is a method for gData, the generic being defined in the graph package.

  • isReachable: tests if one location (actually, the closest node to it) is reachable from the set of nodes of a gData object.

  • connectivityPlot: plots connected sets of a gGraph or a gData object with different colors.

In connectivityPlot, isolated nodes (i.e. belonging to no connected set of size > 1) are plotted in light grey.

Examples


connectivityPlot(rawgraph.10k)

connectivityPlot(worldgraph.10k)