search for: triangulation

Dear all; First of all, this is probably a more conceptual question than a R-related one, but still want to give it a try. When working with the interpolation function "interp" from the package akima and the triangulation function "tri.mesh" from package tripack I've got NA's for the interpolation and "error" for the triangulation. The data is arranged in a regular grid as opposed to what the help page for interp says but I think this is an interesting problem because I found this code on...

This isn''t specific to RSpec, but is hopefully on-topic for this list. I like (especially when "ping pong pairing") to write a spec, then write the smallest amount of code I can to pass it (especially when "ping pong pairing"). Sometimes this means hard-coding a return value, which means another spec is needed to prove that the code is really behaving as it

Dear R-helpers, an rgl-ers in particular, what is the easiest way to plot a section of a plane in 3D, that is given by the xyz coordinates of the outline? Suppose I have a polygon - which I know for sure is a set of coordinates on the same plane. One method I found is to use surf.tri from the geometry package, and then plot the triangles with rgl.triangles. This method is not perfect though,

...elative to them to figure out where everyone is. That?s a rather simple thing to do, isn?t it? Some documentation of HPs MSRs stated that the controller can distribute the wireless devices between access points to even out the bandwidth, and if it can do that, it could as well distribute them for triangulation. >> It is desirable to be able to know where employees currently are, though >> it doesn?t neeed to be as precise. >> >>> When do you need it? >> >> >> There?s no given time frame; it?s as soon as possible and preferably >> this year. >> &gt...

Hi. I've tried to create a polygon with one hole by gpclib using following example script. holepoly <- read.polyfile(system.file("poly-ex/hole-poly.txt", package ="gpclib"), nohole = FALSE) area.poly(holepoly) plot(holepoly,poly.args=list(col="red",border="blue")) And I noticed plot function couldn't draw polygons with holes correctly.

Dear R helpers, I try to use the 'delaunayn' function in the 'geometry' package for Delaunay triangulation in 2 dimensions. For the four following points, I get a warning message : > coord=matrix(ncol=2,byrow=TRUE,c(622633,7073452, + 621228,7073517, + 621879,7071762, + 621065,7073331)) > library(...

Dear useRs, I'm trying to simply fill in the area under a curve using RGL. Here' the set up: x <- c(0.75,75.75,150.75,225.75,300.75,375.75,450.75,525.75,600.75,675.75, 0.5,50.5,100.5,150.5,200.5,250.5,300.5,350.5,400.5,450.5, 0.25,25.25,50.25,75.25,100.25,125.25,150.25,175.25,200.25,225.25) y <- c(0.05,4.91,9.78,14.64,19.51,24.38,29.24,34.11,38.97,43.84,

Pete Biggs wrote: > >>> What do you want? >> >> I was asking for documentation telling me how RADIUS can be used, not only >> that it can be used. > > RADIUS is just an authentication (plus a bit more) protocol - what you > are asking is like asking how LDAP can be used. Usually it's treated > like a magic black box by applications in that one of the

...f the data based on a no Kriging interpolation such as TIN based. I know the first thing I shold do is interpolate a full matrix for the region I have my points for, then contour should do its work. Any idea which function can be used for XYZ interpolations, maybe/hopefully based on a Delaunay triangulation in combination with linear or spline interpolation. Is there a package that allows me to do this? Kris -- ------------------------------------------------------------------------ http://perswww.kuleuven.ac.be/~u0027178/VCard/mycard.php?name=krisn http://gloveg.kuleuven.ac.be -----------...

Hi, does anyone know if there is an implementation of qhull (http://www.qhull.org/) in R? anyone is planning on it? "Qhull computes convex hulls, Delaunay triangulations, halfspace intersections about a point, Voronoi diagrams, furthest-site Delaunay triangulations, and furthest-site Voronoi diagrams. It runs in 2-d, 3-d, 4-d, and higher dimensions. It implements the Quickhull algorithm for computing the convex hull. Qhull handles roundoff errors from floating...

Hello everybody, I would like to solve the problem described below in R (if possible). I am very new to R and have therefore no idea what to even look for in the docu. Therefore, if someone could tell me if this is possible in R and where I might find the respective docu then I would already be very thankful. I have a large set (a few million) of points in 3D. I would like to create a

I am trying to triangulate a point set as follows: > head(cbind(x,y)) x y [1,] -78.1444 -60.4424 [2,] -78.1444 -58.4424 [3,] -78.1444 -56.4424 [4,] -78.1444 -54.4424 [5,] -76.1444 -60.4424 [6,] -76.1444 -58.4424 > length(x) [1] 5000 > tri <- tri.mesh(x, y) Fehler in tri.mesh(x, y) : error in trmesh > tri <- tri.mesh(x, y, "remove") Fehler in tri.mesh(x, y,

...ersp" function to plot it. The algorithm I use is to sort the facets by depth and then to plot them, back to front. This works just as well for triangular facets as rectangular ones. If you'd care to define some data structures (or better yet a class) which will hold a desciption of the triangulation, I can have my student tweak the present code to display the structure. Ross -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe&...

Just been trying to get the polygon triangulation code from this package: http://www-2.cs.cmu.edu/~quake/triangle.html to dyn.load into R. Uh oh. Floating point exceptions. Track it down to some FPU diddling that the author deems is necessary. Here's my minimal code that breaks: flipme.c: #include <fpu_control.h> void flipme(){...

Hi R helpers, Is there a function (package?) in R available which tests "spatial autocorrelation" between points (e.g. vector layer of weather stations)? (e.g. Moran's I...) Via the archives we found out that there is a package 'spdep' which uses grid data for testing spatial autocorrelation. Thanks a lot, Jan

...doing a search for "voronoi". > > The problem here is that `Voronoi tessellation' is a secondary name. The > concept has many names, including Dirichlet tessellation and Thiessen > polygons, and Dirichlet has priority over Voronoi. > > > Also, search for 'triangulation', since that is one of the uses of them. > > I know of packages deldir, tripack and perhaps geometry. > > > -Don > > > > At 11:46 PM -0400 7/18/06, zubin wrote: > > >Hello, looking to draw a voronoi tessellations in R - can anyone > > >recommend a...

Hello List, I'm a very new user to the R system. I'm only beginning to learn the basics, but so far I've been able to do little more than try a few examples, and of course begin reading the documentation. My primary motivation for exploring R is the availability of tools like the 'spdep' package for calculating spatial statistics such as Geary's C and Moran's

Here are a couple things I would try to help triangulate on the problem. Try a vanilla upstream compiler for an in-tree target. (IIRC you have your own target.) If that fails, it's pretty optimal for you because you should be able to reduce a test case and file a PR. If it doesn't fail, that suggests it's either something your target does or doesn't do, or some bug in how

...; everyone is. > > That?s a rather simple thing to do, isn?t it? Some documentation of HPs > MSRs > stated that the controller can distribute the wireless devices between > access > points to even out the bandwidth, and if it can do that, it could as well > distribute them for triangulation. > It isn't. Wireless is much noisier and uses longer wavelengths than light. It is like walking through a hall of mirrors with sunglasses on. You are only able to see certain things, lots of things reflect, everything within sensor range which is broadcasting is showing up even if it is a...

Since updating to the LLVM v5.0 Final tag, I am seeing a crash when I enable '-g'. With a Debug build this hits an assertion at line #923 in 'lib/CodeGen/AsmPrinter/DwarfDebug.cpp': assert(EndLabel && "Forgot label after instruction ending a range!"); The values of related variables at this time are: 'Begin' is: DBG_VALUE %I23, %noreg,