GeoXp (version 1.6.2)

boxplotmap: Interactive boxplot and map

Description

The function boxplotmap() draws a boxplot of the given variable name.var and a map with site of coordinates coordinates(sp.obj).

Usage

boxplotmap(sp.obj, name.var, names.attr=names(sp.obj), criteria=NULL, 
carte=NULL, identify=FALSE, cex.lab=0.8, pch=16, col="lightblue3",
xlab="", ylab="", axes=FALSE, lablong="", lablat="")

Arguments

sp.obj

object of class extending Spatial-class

name.var

a character; attribute name or column number in attribute table

names.attr

names to use in panel (if different from the names of variable used in sp.obj)

criteria

a vector of boolean of size the number of spatial sites, 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 boxplot

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

Value

In the case where user click on save results button, a vector of integer is created as a global variable in last.select object. It corresponds to the number of spatial units selected just before leaving the Tk window.

Details

There is an interactivity only in one direction : the sites selected by interquartile on the boxplot are represented on the map in red.

References

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.

See Also

histomap, histobarmap, scattermap, densitymap

Examples

######
# data columbus
require("maptools")
example(columbus)

# a basic use of boxplotmap
boxplotmap(columbus,"CRIME", criteria=(columbus@data$CP==1),
xlab="Crime",ylab="Percent",identify=TRUE, cex.lab=0.7)

######
# data boston
data(boston)

# creation of a Spatial object
boston.sp = SpatialPoints(cbind(boston.c$LON,boston.c$LAT))
# ... and then by integrating other variables to create SpatialPointsDataFrame
boston.spdf = SpatialPointsDataFrame(boston.sp, boston.c)

# a simple use of boxplotmap
boxplotmap(boston.spdf,"MEDV",criteria=(boston.c$CHAS==1))