layout.fruchterman.reingold(g) returns a random result, so you want to call it once and use the one return value. Also, I think you need to avoid the rescaling that plot.igraph does. It looks like you need to explicitly specify xlim and ylim if you do that, but I may not have looked long enough at it.
plot(g, layout=L, rescale=FALSE, xlim=range(L[,1]), ylim=range(L[,2])) polygon(L[temp1, ], col = "#0000FFAA") Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On > Behalf > Of email > Sent: Thursday, November 14, 2013 10:04 AM > To: r-help@r-project.org > Subject: [R] polygon circling a graph > > Hi: > > I want to create a polygon encircling a graph. For this i use convex > hull to get the coordinate points for polygon. > > g <- barabasi.game(10) > L<-layout.fruchterman.reingold(g) > temp1 <- chull(L) > temp1 <- c(temp1, temp1[1]) > plot(g, layout=layout.fruchterman.reingold) > > > But when i plot the polygon with the code below, the polygon dosen't > encircle the graph. > > polygon(L[temp1, ], col = "#0000FFAA") > > How can I plot a polygon circling a graph? > > Regards: > John > > ______________________________________________ > 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.
