Interface between nb and gra format {BayesX}

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 BayesX 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.

Author(s)

Daniel Sabanes Bove

See Also

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

Examples

## Not run: ## first nb to gra:
if(requireNamespace("sf") &
   requireNamespace("spdep")) {
  library("sf")
  library("spdep")

  columbus <- st_read(system.file("etc/shapes/columbus.shp",
    package = "spdep")[1])
  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")
}

## End(Not run)