Description Usage Arguments Details Value Note Author(s) References See Also Examples
The function histnbmap()
draws the histogram of the distances between two neighbors for
a neighbourhood structure given by a nb
object and calculated by nbdists
function
(see spdep
package), and links the graphic with a map.
1 2 3 4 |
sp.obj |
object of class extending Spatial-class |
nb.obj |
object of class nb |
longlat |
TRUE if point coordinates are longitude-latitude decimal degrees, in which case distances are measured in kilometers; if coords is a SpatialPoints object, the value is taken from the object itself |
nbcol |
number of cells for histogram (10 by default) |
type |
Character string indicating type of histogram to be drawn. "percent" and "count" give relative frequency and frequency histograms, "density" produces a density scale histogram. |
sup |
if TRUE, it keeps only the distance of the neighbor the farest |
criteria |
a vector of boolean of size the number of Spatial units, which permit to represent preselected sites with a cross, using the tcltk window |
carte |
matrix with 2 columns for drawing spatial polygonal contours : x and y coordinates of the vertices of the polygon |
identify |
if not FALSE, identify plotted objects (currently only working for points plots). Labels for identification are the row.names of the attribute table row.names(as.data.frame(sp.obj)). |
cex.lab |
character size of label |
pch |
16 by default, symbol for selected points |
col |
"lightblue3" by default, color of bars on the barplot |
xlab |
a title for the graphic x-axis |
ylab |
a title for the graphic y-axis |
axes |
a boolean with TRUE for drawing axes on the map |
lablong |
name of the x-axis that will be printed on the map |
lablat |
name of the y-axis that will be printed on the map |
For a selected site j on the map, are represented on the map its neighbours. For a selected bar on the graph, the corresponding sites are represented on the map with a link which means that two sites are neighbours.
No value returned.
When user select sites on the graph or on the map, he cannot add a selection by using the other graphic.
Aragon Y., Thomas-Agnan C., Ruiz-Gazen A., Laurent T.
Thibault Laurent, Anne Ruiz-Gazen, Christine Thomas-Agnan (2012), GeoXp: An R Package for Exploratory Spatial Data Analysis. Journal of Statistical Software, 47(2), 1-23.
Roger S.Bivand, Edzer J.Pebesma, Virgilio Gomez-Rubio (2009), Applied Spatial Data Analysis with R, Springer.
moranplotmap
,makeneighborsw
,normw
,nonormmoran
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | ##
# data columbus
require("maptools")
example(columbus)
# a simple use of histnbmap
histnbmap(columbus, col.gal.nb, criteria=(columbus$CP==1),
xlab="distance of the neighbor the farest")
##
# data meuse
data(meuse)
# meuse is a data.frame object. We have to create
# a Spatial object, by using first the longitude and latitude
# to create Spatial Points object ...
meuse.sp = SpatialPoints(cbind(meuse$x,meuse$y))
# ... and then by integrating other variables to create SpatialPointsDataFrame
meuse.spdf = SpatialPointsDataFrame(meuse.sp, meuse)
# meuse.riv is used for contour plot
data(meuse.riv)
# creation of a spatial weight matrix (class nb) based
# on the Delaunay triangulation
meuse.nb <- tri2nb(coordinates(meuse.sp))
# a example with some optionswhich shows the limit of
# this kind of spatial weight matrix
histnbmap(meuse.spdf, meuse.nb, sup=TRUE, nbcol=7,
carte=meuse.riv[c(21:65,110:153),])
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