ade4 (version 1.7-22)

gridrowcol: Complete regular grid analysis

Description

This function defines objects to analyse data sets associated with complete regular grid.

Usage

gridrowcol(nrow, ncol, cell.names = NULL)

Value

Returns a list containing the following items :

xy

: a data frame with grid cell coordinates

area

: a data frame with three variables to display grid cells as areas

neig

: an object of class 'neig' corresponding to a neighbouring graph of the grid (rook case)

orthobasis

: an object of class 'orthobasis' corresponding to the analytical solution for the neighbouring graph

Arguments

nrow

size of the grid (number of rows)

ncol

size of the grid (number of columns)

cell.names

grid cell labels

Author

Sébastien Ollier
Daniel Chessel

References

Méot, A., Chessel, D. and Sabatier, D. (1993) Opérateurs de voisinage et analyse des données spatio-temporelles. in J.D. Lebreton and B. Asselain, editors. Biométrie et environnement. Masson, 45-72.

Cornillon, P.A. (1998) Prise en compte de proximités en analyse factorielle et comparative. Thèse, Ecole Nationale Supérieure Agronomique, Montpellier.

See Also

orthobasis, orthogram, mld

Examples

w <- gridrowcol(8, 5)
par(mfrow = c(1, 2))
area.plot(w$area, center = w$xy, graph = w$neig, clab = 0.75)
area.plot(w$area, center = w$xy, graph = w$neig, clab = 0.75, label = as.character(1:40))
par(mfrow = c(1, 1))

if(adegraphicsLoaded()) {
  fac1 <- w$orthobasis
  names(fac1) <- as.character(signif(attr(w$orthobasis, "values"), 3))
  s.value(w$xy, fac1, porigin.include = FALSE, plegend.drawKey = FALSE, pgrid.text.cex = 0,
    ylim = c(0, 10))

} else {
  par(mfrow = c(5,8))
  for(k in 1:39)
    s.value(w$xy, w$orthobasis[, k], csi = 3, cleg = 0, csub = 2,
     sub = as.character(signif(attr(w$orthobasis, "values")[k], 3)),
      incl = FALSE, addax = FALSE, cgr = 0, ylim = c(0,10))
  par(mfrow = c(1,1))
}