Dear "R-listers" I've been trying to figure out how to annotate charts in ggplot (ie add text to line charts, highlighted boxes etc). By and large, I can get close to what i want with base graphics, but would ideally like to use ggplot whenever possible (additionally, i would like to add text labels automatically to the chart). The code is below
I suspect I need to use geom_rect, but what is foxing me is how to set up the aes() parameters. I'd be very grateful for any help thanks simeon ################### require(zoo) require(chron) vix <-read.csv(" http://www.cboe.com/publish/ScheduledTask/MktData/datahouse/vixcurrent.csv", header=T,sep=",", na.strings="") names(vix) <- tolower(names(vix)) vix$dates <- chron(as.character(vix$date),out.format="d-mon-y") vix.z <- zoo(vix[,-1],vix$dates) vix.close1<-aggregate(vix.z[,4],as.yearmon,max) # 1990 - 2003 vix.ar1 <- read.csv("C:/Data/MindShare/Recession/vixarchive.csv", header=T,sep=",", quote="",na.strings="n/a") names(vix.ar1) <- tolower(names(vix.ar1)) vix.ar1$dates <- chron(as.character(vix.ar1$date),out.format="d-mon-y") vix.ar1.z <- zoo(vix.ar1[,-1],vix.ar1$dates) vix.close2<-aggregate(vix.ar1.z[,4],as.yearmon,max) vix.close<-rbind(vix.close1,vix.close2) op <- par(mar = c(6, 8, 6, 6) + 0.1) gulf1 <- as.yearmon("1990-8-2") gulf2 <- as.yearmon("1991-2-28") asia1 <- as.yearmon("1997-9-11") asia2 <- as.yearmon("1998-11-14") sep1 <- as.yearmon("2001-9-11") sep2 <- as.yearmon("2002-9-14") crunch1 <- as.yearmon("2007-8-9") crunch2 <- as.yearmon("2009-11-14") plot(vix.close, type = "n",ylab="S&P500 volatility", xlab="Date",cex.axis=1.5,cex.lab=1.7,ylim=c(0,90) ) rect(gulf1, par("usr")[3], gulf2, par("usr")[4],col=rgb(195,188,175,maxColorValue=255),border=0) rect(asia1, par("usr")[3], asia2, par("usr")[4],col=rgb(195,188,175,maxColorValue=255),border=0) rect(sep1, par("usr")[3], sep2, par("usr")[4], col=rgb(195,188,175,maxColorValue=255),border=0) rect(crunch1, par("usr")[3], crunch2, par("usr")[4], col=rgb(195,188,175,maxColorValue=255), border = 0) lines(vix.close,lwd=3,col=rgb(45,12,75,maxColorValue=255)) title(main="US STOCK MARKET VOLATILITY 1962-2008 ",adj=0,cex.main=2.3) [[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.