Nothing
sizeplot<-function(x,y,scale=1,pow=0.5,powscale=TRUE,size=c(1,4),add=FALSE,...) {
pair <- function(x, y) paste(x, y, sep = "/")
unpair <- function(x) t(sapply(strsplit(x, "/"), as.numeric))
f<-factor(pair(x, y))
n<-table(f)
if(min(n) == max(n)) {
warning("all points repeated equally (why use sizeplot?)")
if(powscale) psize <- rep(length(f), scale)
else psize <- rep(length(f), size[1])
}
else {
if(powscale) psize<-scale*n^pow
else psize<-size[1]+(size[2]-size[1])*((n-min(n))/(max(n)-min(n)))
}
newpts<-unpair(levels(f))
if(!add) plot(newpts[,1],newpts[,2],cex=psize,type="p",...)
else points(newpts[,1],newpts[,2],cex=psize,...)
}
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