You can do this easily with the DrawCircle() function in package DescTools. It is easiest to use geometric coordinates (0 is at 3 o'clock and moves counterclockwise around the circle), but it could be converted to 12 o'clock and clockwise:
library(DescTools) # Convert begin/stop to radians dat$begin <- 0 + 2 * pi * dat$start/1500 dat$stop <- 0 + 2 * pi * dat$end/1500 # Open blank plot window and draw circles Canvas(xlim = c(-5,5), xpd=TRUE) DrawCircle (r.out = 5, r.in = 5, theta.1=.05, theta.2=2*pi-.05, lwd=3) with(dat, DrawCircle(r.out = 5 - score/5, r.in = 5 - score/5, theta.1=begin, theta.2=stop, border=col, lwd=4)) text(5.2, .4, "1", pos=4) text(5.2, -.4, "1500", pos=4) ------------------------------------- David L Carlson Department of Anthropology Texas A&M University College Station, TX 77840-4352 -----Original Message----- From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of swaraj basu Sent: Monday, February 13, 2017 10:34 AM To: r-help@r-project.org Subject: [R] Circular plot I want to plot segments deleted from mitochondrial DNA of patients with neuromuscular disorders. I generate the plot on a linear chromosome using a code similar to as shown below start<-c(1,5,600,820) end<-c(250,75,810,1200) score<-c(7,-1,4,-6.5) dat<-data.frame(start=start,end=end,score=score,col="blue",stringsAsFactors=F) dat[dat$score<0,]$col<-"red" plot(1:1500,rep(0,1500),type="p",ylim=c(-10,10),col="white",xlab="position",ylab="score") segments(dat$start, dat$score, dat$end, dat$score, col=dat$col, lwd=3) Since the human mitochondria is a circular genome, I would like to visualise the plot generated above as a circle where all segments with positive score lie inside the circle and those with negative score lie outside. Attached is a representation of my requirement, although here it is manually drawn. Can someone help me on this? -- Swaraj Basu
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