search for: chull

Hi everyone, Using a simulation, I have to find what are the probabilities that, in a square region, the convex hull is a triangle, using the "chull" function. However, I have a hard time with the chull function, i did not see many examples in which the chull function is used. I searched a long time on google, but I did not find nothing. So, if anyone can help, Thanks! ____________________________________________________________...

I am modeling a trend surface using trmat and want to trim the resulting matrix to the area enclosed by my real data (i.e., remove all the extrapolated areas). I was using chull and in.chull to calculate the convex hull and change all the other values created by trmat to NA. However, my real data has portions that are slightly concave so chull would give me slivers that are extrapolations from my data. Is there some other type of "chull" function that will allo...

Hello! Is there someone already working on an implementation of Splus' chull() function for R? If not, I would like volunteer to try it. For my "Diplom" I implemented convex peeling in C (some time ago), using an O(n log(n)) algorithm, so it probably will prove relatively easy to use that code for a R-function. Well, as least as easy as any programming tends to...

...the last part of the make output: ----- building package 'grDevices' mkdir ../../../library/grDevices mkdir ../../../library/grDevices/R mkdir ../../../library/grDevices/po mkdir ../../../library/grDevices/afm mkdir ../../../library/grDevices/enc mkdir ../../../library/grDevices/man making chull.d from /scratch/royh/src/bio/R/2.4.0p/src/src/library/grDevices/src/chull.c making devNull.d from /scratch/royh/src/bio/R/2.4.0p/src/src/library/grDevices/src/devNull.c making devPicTeX.d from /scratch/royh/src/bio/R/2.4.0p/src/src/library/grDevices/src/devPicTeX.c making devPS.d from /scratch/...

Dear UseRs, I would like to know which function is the most efficient in finding convex hull of points in 3(or 2)-dimensional case? Functions for finding convex hull is the following: convex.hull (tripack), chull (grDevices), in.chull (sgeostat), convhulln (geometry), convexhull.xy (spatstat), calcConvexHull (PBSmapping). I also would like to know if there is a function that can be used for finding convex hull in multi-dimensional case, that is more than 3- dimension. Thank you in advance.

...uot;frg","omn","bc","co","pr","gg","fg","mf","br","hc") for(i in 1:length(predictores)){ windows() partial(RFfit, pred.var = predictores[i], which.class = "Ard", plot = T, prob = T, chull=T, type="classification",plot.engine = "ggplot2", rug=T) } Esto está, a su vez, dentro de otro loop con varias categorías, por lo que al final son 36 gráficos, que debo hacer con distintos parámetros, por lo que me sería muy útil solucionar el problema, que debe ser una chorr...

Hello there I ` m a newbie in R and have a question about the output of write.table My command looks like this: write.table(datatr$V1[data.chull],file="outr.txt", quote = FALSE, sep = "\t") In the outputfile (outr.txt) I have an "x" in the left corner and a new row with numbers for each column(1,2,3...). I just want the values in my file. What should I change in write.table-command? output now: x 1 179.18143...

Does anybody know if there are functions to: 1. Define a convex hull on a space with more than 2 dimensions? chull just works for a plane. 2. Numerically select elements within a given complex hull. Thanks! Dr. Agustin Lobo Instituto de Ciencias de la Tierra (CSIC) Lluis Sole Sabaris s/n 08028 Barcelona SPAIN tel 34 93409 5410 fax 34 93411 0012 alobo at ija.csic.es http://pangea.ija.csic.es/alobo -.-.-...

...trying to use discriminant analysis or other methods to classify these neurons based on morphological variables such as total tree length, segment number etc. I would like to calculate a 3D convex hull for a set of X,Y,Z data points which define the tips of my neurons. I have found the R function chull which finds a 2D convex hull, but not have found any 3D routines. I wondered if there were any packages / publicly available code I could use. Having found the convex hull, it would be handy if there were also functions to find the centroid, volume etc. I've only been using R for 10 days and...

What is plot.new? and how can i get it to work so i can load other data? > library(splancs) > area = 6*4 > lambda = 1.5 > N = rpois(1,lambda*area) > u = runif(N,-2,4) > v = runif(N,0,4) > plot(u,v,asp=1) > h = chull(u,v) > h = c(h,h[1]) > plot(u[h],v[h],"1",asp=1) Error in plot.xy(xy, type, ...) : invalid plot type '1' > plot(u[h],v[h],"l",asp=1) > points(u,v) Error in plot.xy(xy.coords(x, y), type = type, ...) : plot.new has not been called yet > pts=as.points(u,v)...

Dear Friends, Here is an algorithm for finding concave hulls: http://get.dsi.uminho.pt/local/ Has anyone implemented such an algorithm in R? RSiteSearch('concave hull') didn't reveal one (I think). _____________________________ Professor Michael Kubovy University of Virginia Department of Psychology Postal Address: P.O.Box 400400, Charlottesville, VA 22904-4400 Express Parcels

Dear list, Does anyone have a suggestion (or better still) code for sampling from the uniform distribution over the convex hull of a set of points? Many thanks and best wishes, Ranjan

Does anyone know of a R package that will determine the convex hull of a high-dimensional dataset (say 4-10 dimensions). I know chull works for 2D data. I'm neophyte to R and convex hulls so please keep it simple. Many thanks Ben -- Ben Stapley. Biomolecular Sciences, UMIST, PO Box 88, Manchester M60 1QD. Tel 0161 200 5818 Fax 0161 236 0409 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-...

Sorry, this is probably quite an easy question, but I'm new to R and couldn't find the answer anywhere. I'm using geoR and geoRglm, but can't figure out how to get a border in my geodata object. Does this need to be defined when I'm importing my data, or afterwards, and how do I go about doing this? Thanks -- View this message in context:

Hi, I am using the bagplot function within the aplpack package and often get this error: Error in chull(pg[, 1], pg[, 2]) : NA/NaN/Inf in foreign function call (arg 2) Here's an example of data for which this happens: bagplot(c(-4.66, -2.62, -3.65 ,-3.07 ,-4.91, -4.56 ,-3.79, -3.10, -3.01), c(2.14, -7.18, -0.15 , 2.67, -2.49, -0.89 , 0.96 , 0.59, -4.59)) Can anyone help? -- Vie...

Here are the functions documented in the Blue Book that I found missing in R (ignoring the ones which are obviously outdated). aggregate allocated amatch axes chull clorder cutree cycle date debugger dget discr faces interp l1fit labclust lag loglin monthplot mstree mulbar napsack odometer persp plclust plotfit rep.int restore rreg sabl sablplot set.seed smooth sort.list Stable stars starsymb storage subtree symbols tempfile tslines tsmatrix tsplot tspoin...

....sun.com/sunstudio/index.jsp) R builds and passes make check fine without optimising. However, when I try to compile with optimisation turned on (-fast) the build gets stuck in an infinite loop at the following point: Sun_Studio/sunstudio12/bin/cc -m64 -shared -Kpic -m64 -fPIC -o grDevices.so chull.o devNull.o devPicTeX.o devPS.o devQuartz.o init.o mkdir -p -- ../../../../library/grDevices/libs make[5]: Leaving directory `/export/home/leonardz/ccb/HPF/support/R-2.5.1/ss12/R-2.5.1/src/library/grDevices/src' make[4]: Leaving directory `/export/home/leonardz/ccb/HPF/support/R-2.5.1/ss12/R-2....

...ring 'make' I receive the following error-message: [......] g77 -mieee -g -O2 -c dtrco.f -o dtrco.o g77 -mieee -g -O2 -c dtrsl.f -o dtrsl.o g77 -mieee -g -O2 -c eigen.f -o eigen.o g77 -mieee -g -O2 -c lminfl.f -o lminfl.o ar cr libappl.a Rsock.o approx.o bakslv.o binning.o chisqsim.o chull.o cpoly.o cumsum.o distance.o fft.o fmin.o fortran.o lbfgsb.o loglin.o lowess.o machar.o maxcol.o massdist.o pretty.o rowsum.o sock.o splines.o stem.o strsignif.o tabulate.o uncmin.o zeroin.o ch2inv.o chol.o dpbfa.o dpbsl.o dpoco.o dpodi.o dpofa.o dposl.o dqrdc.o dqrdc2.o dqrls.o dqrsl....

Hello everybody,I am having an error while compiling R-2.5.0 on Linux powerpc. This is what I see when I do a make: gcc -std=gnu99 -shared -L/usr/local/lib -o grDevices.so chull.o devNull.o devPicTeX.o devPS.o devQuartz.o init.o ../../../../library/grDevices/libs/grDevices.so is unchanged make[5]: Leaving directory `/home/vivekv/sw_alg/R-2.5.0/src/library/grDevices/src' make[4]: Leaving directory `/home/vivekv/sw_alg/R-2.5.0 /src/library/grDevices/src' Warning: un...

Dear R gurus and users, I seem to have problem finding the right tool for plotting convex hulls over 2D plots, after a cluster analysis. In fact I would like to draw a convex hull in 2D for a generic group of points. I found a "convhulln", but this doesn't seem to give me a convex hull. Here is what I do: > library(mvtnorm) > Mean <- c(2,1) > Sigma <-