Tkp: no visible global function definition for 'is.spam'
addObservations: no visible global function definition for 'bbox'
addObservations: no visible global function definition for 'as.ppp'
addObservations: no visible global function definition for 'nncross'
addObservations: no visible global function definition for 'plot'
addObservations: no visible global function definition for 'points'
addQuantVar: no visible global function definition for 'bbox'
addQuantVar: no visible global function definition for 'as.ppp'
addQuantVar: no visible global function definition for 'nncross'
addQuantVar: no visible global function definition for 'plot'
addQuantVar: no visible global function definition for 'points'
areaRegion: no visible global function definition for 'areapl'
crossvalDensity: no visible global function definition for 'plot'
crossvalNparReg: no visible global function definition for 'plot'
editLattice: no visible global function definition for 'card'
editLattice: no visible global function definition for 'plot.new'
editLattice: no visible global function definition for 'plot.window'
editLattice: no visible global function definition for 'lines'
editLattice: no visible global function definition for 'segments'
editLattice: no visible global function definition for 'points'
editLattice: no visible global function definition for 'par'
editLattice: no visible global function definition for 'identify'
editLattice: no visible global function definition for 'bringToTop'
formLattice: no visible global function definition for 'dnearneigh'
homerange: no visible global function definition for 'plot'
homerange: no visible global function definition for 'points'
homerange: no visible global function definition for 'lines'
makeTmatrix: no visible global function definition for 'as.spam.listw'
makeTmatrix: no visible global function definition for 'nb2listw'
makeTmatrix: no visible global function definition for 'diag.spam'
makeTmatrix: no visible global function definition for 'nb2mat'
nodeFilling: no visible global function definition for 'flush.console'
nodeFilling: no visible global function definition for 'inout'
nodeFilling: no visible global function definition for 'as.points'
plot.NparRegOut: no visible global function definition for 'contour'
plot.NparRegOut: no visible global function definition for 'lines'
plot.densityOut: no visible global function definition for 'contour'
plot.densityOut: no visible global function definition for 'lines'
plot.densityOut: no visible global function definition for 'points'
plot.formLatticeOutput: no visible global function definition for
  'plot'
plot.formLatticeOutput: no visible global function definition for
  'lines'
plot.formLatticeOutput: no visible global function definition for
  'card'
plot.formLatticeOutput: no visible global function definition for
  'points'
plot.nodeFillingOutput: no visible global function definition for
  'plot'
plot.nodeFillingOutput: no visible global function definition for
  'points'
plot.nodeFillingOutput: no visible global function definition for
  'lines'
predict.NparRegOut: no visible global function definition for 'bbox'
predict.NparRegOut: no visible global function definition for 'as.ppp'
predict.NparRegOut: no visible global function definition for 'nncross'
removeHole: no visible global function definition for 'inout'
Undefined global functions or variables:
  areapl as.points as.ppp as.spam.listw bbox bringToTop card contour
  diag.spam dnearneigh flush.console identify inout is.spam lines
  nb2listw nb2mat nncross par plot plot.new plot.window points segments
Consider adding
  importFrom("grDevices", "bringToTop")
  importFrom("graphics", "contour", "identify", "lines", "par", "plot",
             "plot.new", "plot.window", "points", "segments")
  importFrom("utils", "flush.console")
to your NAMESPACE file.