Thank you, Marcelino, Roger and Alexander, I didn't know any of these. Cheers, Javier ...
> This seems a single linkage clustering issue: > > > grouping <- hclust(dist(data.frame(x,y)),"single") > > cutree(grouping, h=0.5) > [1] 1 1 1 2 3 3 3 > > Cheers, > > Marcelino > > > > At 13:04 26/10/2010, jgar...@ija.csic.es wrote: >>Dear all, >>I am wondering if there is a direct function (I cannot find any) in R, to >>obtain, a "factor" vector to identify which points could be grouped in a >>set, using a specific threshold distance as clustering criterion. >> >>#e.g, with 7 points with coordinates: >> >>x <- c(1.01,0.95,1.05,1.03,3.03,2.99,3.04) >>y <- c(3.01,3.02,3.04,5.23,2.01,2.02,1.98) >> >># and, let's say, distance threshold 0.5, the answer would be: >>(1,1,1,2,3,3,3) >> >># where the threshold is the maximum distance between any two points for >>each cluster >> >>A better approach would be that threshold could be specified as the >>distance between any point in each cluster, and its corresponding center >>of mass for that cluster, but I guess this would require some loops. >> Isn't >>it? S, I would be happy enough with the abovementioned approach. >> >>If there isn't a direct function, don't worry. I'll try to find a >> solution >>computing distances... >> >>Thanks, >>Javier >>--- >> >> >> >> >> > is it possible to load a complete Grass mapset into a raster stack or >> > brick >> > with a single command? >> > >> > -- >> > View this message in context: >> > >> http://r-sig-geo.2731867.n2.nabble.com/Grass-and-raster-package-tp5667199p5667199.html >> > Sent from the R-sig-geo mailing list archive at Nabble.com. >> > >> > _______________________________________________ >> > R-sig-Geo mailing list >> > R-sig-Geo@stat.math.ethz.ch >> > https://stat.ethz.ch/mailman/listinfo/r-sig-geo >> > >> >>_______________________________________________ >>R-sig-Geo mailing list >>R-sig-Geo@stat.math.ethz.ch >>https://stat.ethz.ch/mailman/listinfo/r-sig-geo > > ____________________________________ > > Marcelino de la Cruz Rot > Depto. Biologia Vegetal > EUIT Agricola > Universidad Politecnica de Madrid > > tel: 34 + 913365435 > ____________________________________ _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo