Dear R users, I am thinking about an easy and especially fast solution to calculate the x,y coordinates of the interesection between the borders of the red circle and the line.
short example: plot(c(-3,0,3,9,21),c(-8,0,5,12,25)) draw.circle(0,0,radius=6,border="red",col=NA,lty=1,lwd=1) x <- c(-12,-6,-1,0,13,21) y <- c(-19,-10,-5,0,9,25) plot(x,y) require(plotrix) draw.circle(0,0,radius=6,border="red",col=NA,lty=1,lwd=1) lines(c(-12,-6,-1,13,21),c(-19,-10,-5,9,25),cex=2) At the moment I am interpolating the points which gives the basis coordinates of the line. I do this with approx() and then I check which point is within the circle and which one is not. The probleme is, that this method is not really exact and for my dataset it takes too much time. Thanks. With best regards -- View this message in context: http://r.789695.n4.nabble.com/Intersection-between-circle-and-line-tp3844063p3844063.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
