Dear all, Does anyone know of a function that calculates the area of the outer polygon constructed from a data frame with co-ordinates? For example, library(splancs) test = rbind(c(0,0), c(10,0),c(10,10),c(0,20)) plot(test) areapl(test) [1] 150 This is OK, but I want the same area to be returned (150) when adding yet another co-ordinate in the middle of the polygon: test = rbind(c(0,0), c(10,0),c(10,10),c(0,20),c(5,5)) plot(test) areapl(test) [1] 100
I have also tested area.owin() in library(spatstat) but the co-ordinates of the outer polygon is one of the arguments. Thanks! Tord -- NOTE, new e-mail and contact information: Tord Snäll Department of Conservation Biology Swedish University of Agricultural Sciences (SLU) P.O. 7002, SE-750 07 Uppsala, Sweden Office/Mobile/Fax +46-18-672740/+46-730-891356/+46-18-673537 E-mail: [EMAIL PROTECTED] www.nvb.slu.se/staff_tordsnall ______________________________________________ R-help@stat.math.ethz.ch 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.
