SymbLegend function

Plot Legend

Plot Legend

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

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!)

Returns

No return value, creates a plot.

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.

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.

Author(s)

Peter Filzmoser <P.Filzmoser@tuwien.ac.at > http://cstat.tuwien.ac.at/filz/

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")
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