The symbols function may work better than plot for this situation. -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.s...@imail.org 801.408.8111
> -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- > project.org] On Behalf Of servet ahmet çizmeli > Sent: Thursday, December 10, 2009 6:18 AM > To: r-help@r-project.org > Subject: [R] plotting with varying dot sizes > > Dear all, > > I am trying to plot on a spatial map the punctual measurements of the > data > located in the file (https://opengeo.metu.edu.tr/test.csv). I'd like to > have > the dots in some way proportional to the magnitudes of the > measurements. > > I have difficulties with the code given below: The dot sizes do not > vary not > proportionally when varying the coefficient ("0.725"). It either plots > the dots > extremely big or extremely small. Successively running the plot command > from > the command line gives each time different results in an unpredictably > random > way. > > Is this a bug or am I missing something? > Servet > > Running R version 2.8.1 (2008-12-22) on Ubuntu 9.10. > > > *********************************************************************** > ******* > library(sp) > > Insitu = read.table("test.csv", skip=3,sep=",") > Header = read.table("test.csv", skip=1,sep=",",nrows=1) > names(Insitu)= as.character(as.matrix(Header)) > CRS_4326 = CRS("+init=epsg:4326") > > Insitu_sp <- > SpatialPointsDataFrame(cbind(Insitu[,"Boylam"],Insitu[,"Enlem"]), > data=Insitu, proj4string=CRS_4326) > > plot(Insitu_sp[,"SPM"],col="black",pch=19,cex=0.725*sqrt(Insitu["SPM"]) > ) > > ______________________________________________ > 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.
