adegraphics (version 1.0-21)

adeg.panel.nb: Panel functions for adding graphs.

Description

Panel function for representing a graph into a trellis graphic (lattice package).
Two types of graph objects can be used: nb or listw object (spdep package) or simple edges informations.
Directions associated with the edges are not displayed.

Usage

adeg.panel.nb(nbobject, coords, col.edge = "black", lwd = 1, lty = 1, pch = 20, 
  cex = 1, col.node = "black", alpha = 1)
adeg.panel.edges(edges, coords, col.edge = "black", lwd = 1, lty = 1, pch = 20, 
  cex = 1, col.node = "black", alpha = 1)

Value

Displays the neighboring graph.

Arguments

nbobject

a object of class nb or listw

edges

a two columns matrix, representing the edges between the nodes. For a row i, x[i, 1] and x[i, 2] are linked, x[i, 1] and x[i, 2] being vertices number.

coords

a two columns matrix containing vertices' coordinates

col.edge

edges' color(s)

lwd

line width (edges). Can be a vector

lty

line type (edges). Can be a vector

pch

vertices' representation type (symbols). Can be a vector

cex

symbols' size(s) (vertices). Can be a vector

col.node

vertices' color(s). Can be a vector

alpha

symbols' transparency

Author

Alice Julien-Laferriere, Aurelie Siberchicot and Stephane Dray

References

Package spdep. Author: Roger Bivand

See Also

plot.nb

Examples

if(require(lattice, quietly = TRUE) &
  require(spdep, quietly = TRUE)) {

  data(elec88, package = "ade4")
  coords <- elec88$xy
  xyplot(coords[, 2] ~ coords[, 1],
    panel = function(...){adeg.panel.nb(elec88$nb, coords, col.edge = c("blue", "red"))})
}

if(require(lattice, quietly = TRUE)) {
  edges <- matrix(c(1, 2, 3, 2, 4, 1, 3, 4), byrow = TRUE, ncol = 2)
  coords <- matrix(c(0, 1, 1, 0, 0, -1, -1, 0), byrow = TRUE, ncol = 2)
  xyplot(coords[,2] ~ coords[,1],
    panel = function(...){adeg.panel.edges(edges, coords, lty = 1:4, cex = 5)})
}