?jitter is simpler: x<-rep(1:10,10) y<-x plot(x,y) #100 points, only 10 show plot(jitter(x),jitter(y)) #overlap removed.
>>> Milton Cezar Ribeiro <[EMAIL PROTECTED]> 18/12/2007 04:36 >>> Hi Wayne, I have two suggestion to you. 1. You add some random noise on both x and y data or 2. You graph bubble points, where the size is proportional to the frequence of the xy combination. x<-sample(1:10,10000,replace=T) y<-sample(1:10,10000,replace=T) xy<-cbind(x,y) x11(1400,800) par(mfrow=c(1,3)) plot(xy) xy.random<-xy+rnorm(20000,0.1,0.1) plot(xy.random,cex=0.1) xy.tab<-data.frame(table(x,y)) xy.tab$x<-as.numeric(as.character(xy.tab$x)) xy.tab$y<-as.numeric(as.character(xy.tab$y)) min.freq<-min(xy.tab$Freq) max.freq<-max(xy.tab$Freq) plot(xy.tab$x,xy.tab$y,cex=(xy.tab$Freq-min.freq)/(max.freq-min.freq)*5) Kind regards, Miltinho Brazil ----- Mensagem original ---- De: Wayne Aldo Gavioli <[EMAIL PROTECTED]> Para: r-help@r-project.org Enviadas: Segunda-feira, 17 de Dezembro de 2007 22:14:23 Assunto: [R] Scatterplot Showing All Points Hello all, I'm trying to graph a scatterplot of a large (5,000 x,y coordinates) of data with the caveat that many of the data points overlap with each other (share the same x AND y coordinates). In using the usual "plot" command, > plot(education, xlab="etc", ylab="etc") it seems that the overlap of points is not shown in the graph. Namely, there are 5,000 points that should be plotted, as I mentioned above, but because so many of the points overlap with each other exactly, only about 50-60 points are actually plotted on the graph. Thus, there's no indication that Point A shares its coordinates with 200 other pieces of data and thus is very common while Point B doesn't share its coordinates with any other pieces of data and thus isn't common at all. Is there anyway to indicate the frequency of such points on such a graph? Should I be using a different command than "plot"? Thanks, Wayne ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. para armazenamento! [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
