SymbLegend: Plot Legend

In StatDA: Statistical Analysis for Environmental Data

Plot Legend

Description

Plots symbols and Legend on a map. There are two different methods (percentile symbols or boxplot symbols) to display the legend.

Usage

SymbLegend(X, Y, z, type = "percentile", qutiles = c(0, 0.05, 0.25, 0.75, 0.95, 1),
q = NULL, symbtype = "EDA", symbmagn = 0.8, leg.position = "topright",
leg.title = "", leg.title.cex = 0.8, leg.round = 2, leg.wid = 4, leg.just = "right",
cex.scale = 0.8, xf = 9000, logscale = TRUE, accentuate = FALSE)

Arguments

X	X-coordinates
Y	Y-coordinates
z	values on the coordinates
type	"percentile" for percentile legend, "boxplot" for boxplot legend
qutiles	considered quantiles if type="percentile" is used
q	if not NULL, provide manually data points where to break
symbtype	type of symbols to be used; "EDA", "EDAacc", "EDAacc2", "EDAext", "GSC" or "arbit"
symbmagn	magnification factor for symbols
leg.position	position of the legend, either character like "topright" or coordinates
leg.title	title for legend
leg.title.cex	cex for legend
leg.round	round legend to specified digits "pretty"
leg.wid	width (space in numbers) for legend
leg.just	how to justify the legend
cex.scale	cex for text "log-scale" and for boxplot legend - only for type="boxplot"
xf	x-distance from boxplot to number for legend
logscale	if TRUE a log scale is used (for boxplot scale) and the log-boxplot is computed
accentuate	if TRUE, accentuated symbols are used (here only EDA accentuated!)

Details

It is possible to choose between different methods for calculating the range of the values for the different symbols.

If type="percentile" the pre-determined quantiles of the data are computed and are used to plot the symbols. If type="boxplot" a boxplot is computed and the values were taken to group the values fot the plot and the legend. In the case that a log scale is used the function boxplotlog is used instead of boxplot.

Value

No return value, creates a plot.

Author(s)

Peter Filzmoser <[e-mail]> http://cstat.tuwien.ac.at/filz/

References

C. Reimann, P. Filzmoser, R.G. Garrett, and R. Dutter: Statistical Data Analysis Explained. Applied Environmental Statistics with R. John Wiley and Sons, Chichester, 2008.

Examples

data(chorizon)
data(kola.background)
el=chorizon[,"As"]
X=chorizon[,"XCOO"]
Y=chorizon[,"YCOO"]

plot(X,Y,frame.plot=FALSE,xaxt="n",yaxt="n",xlab="",ylab="",type="n")
plotbg(map.col=c("gray","gray","gray","gray"),add.plot=TRUE)

SymbLegend(X,Y,el,type="percentile",qutiles<-c(0,0.05,0.25,0.75,0.95,1),symbtype="EDA",
symbmagn=0.8,leg.position="topright",leg.title="As [mg/kg]",leg.title.cex=0.8,leg.round=2,
leg.wid=4,leg.just="right")

StatDA documentation built on June 7, 2023, 6:26 p.m.