Look at the polylineoffset function in the polyclip package. It looks like it does what you are asking for.
On Mon, Nov 2, 2015 at 5:33 AM, WRAY NICHOLAS <nicholas.w...@ntlworld.com> wrote: > Hi I am plotting various strands of information, and I want to create an > "envelope" around each line, so that the locus of the envelope is the boundary > points no more than a fixed maximum distance from the plotted line, a bit like > drawing a larger rectangle with paralle sides and curved compass corners > around > a smaller rectangle. Obviously I can work out how to do this in code > (eventually) but I suspect it would take me a while and i was wondering > whether > there was some R function which I don't know about which creates sets of of > points at a given maximal distance > > the lines are simple vectors, ie like this noddy example > > veca<-c(4,3,6,5,7,3,2,3,3,6,8,7) > plot(veca,type="l",lwd=2) > > then I want to plot the locus of the boundary of all points no more than > (say) 1 > unit from the line I imagine that one would have to provide a larger set of > interpolated points between the actual points of veca, but I can do that no > problem > > I'd be grateful if anyone out there in the R-ethervoid has any ideas > > Thanks, Nick Wray > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. -- Gregory (Greg) L. Snow Ph.D. 538...@gmail.com ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
