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GeoXp (version 1.6.2)

dblehistomap: Double Interactive Histogram and map

Description

The function dblehistomap draws two histograms of the given variables names.var[1] and names.var[2] and a map with sites of coordinates coordinates(sp.obj). Each site is associated to a value of names.var[1] and names.var[2] and there is interactivity between the two windows created.

Usage

dblehistomap(sp.obj, names.var, nbcol=c(10,10), type = c("count","percent", "density"), names.attr=names(sp.obj), criteria=NULL, carte=NULL, identify=FALSE, cex.lab=0.8, pch=16, col=c("grey","lightblue3"), xlab=c("",""), ylab=c("count","count"), axes=FALSE, lablong="", lablat="")

Arguments

sp.obj
object of class extending Spatial-class
names.var
a vector of 2 characters; attribute name or column number in attribute table
nbcol
a vector of integer indicating number of cells for histogram 1 and histogram 2 (10 for each 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.
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 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
a vector of character indicating colors for the bars on the histogram 1 and histogram 2
xlab
a vector of character containing titles for the two graphics x-axis
ylab
a vector of character containing titles for the two graphics 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

The selection of sites by `points' or `polygons' on the map results in the drawing of the red histograms of the subdistributions corresponding to this subset of sites.

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.

See Also

dblehistomap, histobarmap, scattermap, densitymap

Examples

Run this code
######
# data on price indices of real estate in France
data(immob)
row.names(immob)<-immob$Nom

# immob is a data.frame object. We have to create
# a Spatial object, by using first the longitude and latitude
# to create Spatial Points object ...
immob.sp = SpatialPoints(cbind(immob$longitude,immob$latitude))
# ... and then by integrating other variables to create SpatialPointsDataFrame
immob.spdf = SpatialPointsDataFrame(immob.sp, immob)
# For more details, see vignette('sp', package="sp")

# optional : we add some contours that don't correspond to the spatial unit
# but are nice for mapping
require("maptools")
midiP <- readShapePoly(system.file("shapes/region.shp", package="GeoXp")[1])
cont_midiP<-spdf2list(midiP[-c(22,23),])$poly

# A basic call of dblehistomap function
dblehistomap(immob.spdf,c("prix.vente","prix.location"),
carte= cont_midiP, identify=TRUE, cex.lab=0.6)

###
# data colombus
x <- readShapePoly(system.file("shapes/columbus.shp", package="maptools")[1])

# example of use with many options
dblehistomap(x,c("HOVAL","CRIME"), nbcol=c(5,10),type="percent",
xlab=c("hoval","crime"),identify=TRUE, cex.lab=0.7, ylab=c("percent","percent"),
col=c("pink","orange"),pch=14,axes=TRUE)

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