R2BayesX (version 0.3-1)

Interface between nb and gra format: Convert nb and gra format into each other

Description

Convert neighborhood structure objects of class "nb" from R-package spdep to graph objects of class "gra" from R-package R2BayesX and vice versa.

Usage

nb2gra(nbObject)
gra2nb(graObject)

Arguments

nbObject

neighborhood structure object of class "nb"

graObject

graph object of class "gra"

Value

• Equivalent object in the other format.

See Also

sp2bnd, bnd2sp for conversion between the geographical information formats and read.gra, write.gra for the interface to the R2BayesX files.

Examples

## first nb to gra:
if(require("spdep")) {
  example(columbus)
  colNb <- poly2nb(columbus)

  ## ... here manual editing is possible ...
  ## then export to graph format
  colGra <- nb2gra(colNb)

  ## and save in BayesX file
  graFile <- tempfile()
  write.gra(colGra, file=graFile)

  ## now back from gra to nb:
  colGra <- read.gra(graFile)
  newColNb <- gra2nb(colGra)
  newColNb

  ## compare this with the original
  colNb

  ## only the call attribute does not match (which is OK):
  all.equal(newColNb, colNb, check.attributes = FALSE)
  attr(newColNb, "call")
  attr(colNb, "call")
}