search for: deldir

The problem: I would like to translate the Octave algorithm in griddata.m to R. Within the griddata algorithm calls are made to the Delaunay function. For the R translation I have found delaunayn within the "geometry" package and also the deldir package. Both do similar things but give slightly different results depending on the input. The question is, what is making the results for the R packages different from each other? And are those differences down to the decimal precision in the latter case of using 9 d.p.? In the following example...

...at fugro.com> wrote: > The problem: > I would like to translate the Octave algorithm in griddata.m to R. > Within the griddata algorithm calls are made to the Delaunay function. For > the R translation I have found delaunayn within the "geometry" package and > also the deldir package. > Both do similar things but give slightly different results depending on > the input. > The question is, what is making the results for the R packages different > from each other? > And are those differences down to the decimal precision in the latter case > of using 9 d...

...t; > > > Regards, > > > > Kam > > > > > > *From:* William Dunlap [mailto:wdunlap at tibco.com] > *Sent:* 24 January 2018 19:29 > *To:* Yuen, Kam <k.yuen at fugro.com> > *Cc:* r-help at r-project.org > *Subject:* Re: [R] Geometry delaunayn and deldir results, differing > results from Octave due to decimal precision? > > > > All three results give the same collection of triangles. They > > don't all agree on whether the points in a triangle are in clockwise > > or counterclockwise order. If the orientation matter...

...just getting started with using R - I have been trying over the past day or so to work out a method for generating voronoi polygons for PostGIS using SQL. I was able to put together a procedure which works relatively well, but is somewhat inefficient. Someone on the PostGIS list pointed me to the deldir() function in R, for which I can export a text file with x/y coordinates from a PostGIS table, and write an SQL script with insert statements containing PostGIS ewkt-compatible geometries representing the voronoi polygons generated by deldir(). The script I'm using is below. I've added a...

Anyone knows how to convert a deldir$delsgs to a X3D IndexedTriangleSet? Are there already any functions/packages? [[alternative HTML version deleted]]

...11.1. install.packages("spatstat", dependencies = TRUE) fails on the basis of various compiler packages (full message below). I have gcc version 4.3.2, which should include gfortran and g++ - so I'm not sure what to do! Richard * Installing *source* package ?deldir? ... ** libs gfortran -fpic -O2 -c acchk.f -o acchk.o make: gfortran: Command not found make: *** [acchk.o] Error 127 ERROR: compilation failed for package ?deldir? * Removing ?/home/richard/R/i686-pc-linux-gnu-library/2.9/deldir? * Installing *source* package ?spatst...

Good evening to all. I find myself trying to create some Thiessen Polygons, in order to finish a meteorology research. This is the script I found to create the Polygons: * * *voronoipolygons <- function(x) {* * require(deldir)* * if (.hasSlot(x, 'coords')) {* * crds <- x@coords * * } else crds <- x* * z <- deldir(crds[,1], crds[,2])* * w <- tile.list(z)* * polys <- vector(mode='list', length=length(w))* * require(sp)* * for (i in seq(along=polys)) {* * pcrds <- cbind(w[[...

A package for calculating and plotting the Delaunay triangulation and the Dirichlet/Voronoi tessellation, of a planar set of points, is now available from CRAN. The package is called ``deldir''. The package consists of a port from Splus to R of a library section which has been available for some time from the Splus software segment of statlib. (The Splus library section is called ``delaunay'' --- not my choice of name --- rather than ``deldir''.) Thanks to Kur...

For "importance" it's probably best to stick with absolute values of coefficients, instead of value of the penalty parameter for which the coefficients changed to non-zero. Friedman skipped a lot of details on his rule ensemble in that talk, due to time constraint. In his implementation he was using his own algorithm, PathSeeker, for which paper and software are available on his

...issue. > Warm regards. > > >> install.packages("openair", type = "source")Installing package into ?C:/R_Libs? > (as ?lib? is unspecified)Warning in install.packages : > dependencies ?lattice?, ?MASS? are not availablealso installing the > dependencies ?deldir?, ?RcppEigen?, ?cli?, ?glue?, ?lifecycle?, > ?pillar?, ?rlang?, ?tibble?, ?tidyselect?, ?vctrs?, ?png?, ?jpeg?, > ?interp?, ?timechange?, ?maps?, ?nlme?, ?Matrix?, ?cluster?, ?dplyr?, > ?hexbin?, ?latticeExtra?, ?lubridate?, ?mapproj?, ?mgcv?, ?purrr? > trying URL ' https://cran.rst...

...ails: call: assignInNamespace(".M.classEnv", .M.classEnv, ns = "base") error: locked binding of ''.M.classEnv'' cannot be changed Error: package ''mgcv'' could not be loaded/ Ya cargué el paquete "mgcv" y tambien un paquete "deldir" que lei por ahi que tambien se necesita pero no funciona. Espero que me puedan ayudar, muchas gracias. Dante Loto [[alternative HTML version deleted]]

...> > > >> install.packages("openair", type = "source")Installing package into > ?C:/R_Libs? > > (as ?lib? is unspecified)Warning in install.packages : > > dependencies ?lattice?, ?MASS? are not availablealso installing the > > dependencies ?deldir?, ?RcppEigen?, ?cli?, ?glue?, ?lifecycle?, > > ?pillar?, ?rlang?, ?tibble?, ?tidyselect?, ?vctrs?, ?png?, ?jpeg?, > > ?interp?, ?timechange?, ?maps?, ?nlme?, ?Matrix?, ?cluster?, ?dplyr?, > > ?hexbin?, ?latticeExtra?, ?lubridate?, ?mapproj?, ?mgcv?, ?purrr? > > trying URL ...

...>> install.packages("openair", type = "source")Installing package into >> ?C:/R_Libs? >> > (as ?lib? is unspecified)Warning in install.packages : >> > dependencies ?lattice?, ?MASS? are not availablealso installing the >> > dependencies ?deldir?, ?RcppEigen?, ?cli?, ?glue?, ?lifecycle?, >> > ?pillar?, ?rlang?, ?tibble?, ?tidyselect?, ?vctrs?, ?png?, ?jpeg?, >> > ?interp?, ?timechange?, ?maps?, ?nlme?, ?Matrix?, ?cluster?, ?dplyr?, >> > ?hexbin?, ?latticeExtra?, ?lubridate?, ?mapproj?, ?mgcv?, ?purrr? >> &g...

There's Renka's STRIPACK, and TRIPACK, respectively, ACM TOMS Algorithms 772 and 751, and there's the R package "deldir" which does the Delaunay for a plane, but does anyone have or know of the tessellation in R for a sphere? Also, is there a standard indexing scheme for Delaunay facets, and perhaps of edges in such facets? I'd expect that to be a publication reference, or even textbook. TIA, - Jan...

...> 6 Ernie 27.09.2012 10:00 8.481 54.751 # Now this is where my loop is supposed to start. In this example I want #to run the following functions 3 times. (In real life more often.) How #do I do that? library(adehabitatHR) #> Loading required package: sp #> Loading required package: deldir #> deldir 0.1-14 #> Loading required package: ade4 #> Loading required package: adehabitatMA #> Loading required package: adehabitatLT #> Loading required package: CircStats #> Loading required package: MASS #> Loading required package: boot library(rgdal) #> rgdal: version:...

...elation so that the polygon size for each tree depends on the size of the subject tree, and the size of its neighbors. So, the location of the bisection between two trees would not necessarily be at the midpoint, but determined by the tree sizes. I have looked through the options in tripack and deldir-packages, but editing the functions in those packages is beyond my skills. Thanks, Tuomas

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, +

Hi all, Given a number of points (x,y) in a plane, I'd like to plot a map of polygons, so that 1) each polygon contains exactly one point 2) the polygon defines the area for which this specific point is closer than any other point. It's a bit like a map of areas "influenced" by that point, and it's obviously a matter of intersecting the perpendicular bisectors

Cada vez que intento cargar el paquete "agricolae" me da el siguiente mensaje: Error: package or namespace load failed for 'agricolae' in loadNamespace(i, c(lib.loc, .libPaths()), versionCheck = vI[[i]]): there is no package called 'spData' He intentado todo actualizar los paquetes, volverlos a instalar pero no hay forma. Si sabeis la solución ?? Un saludo. Juan

I have just installed R version 2.14.0 and tried to re-build and re-check some of the packages that I maintain. I'm getting a warning (in the process of running R CMD check on my "deldir" package): > * checking PDF version of manual ... WARNING > LaTeX errors when creating PDF version. > This typically indicates Rd problems. > LaTeX errors found: > ! Font T1/fi4/m/n/10=ec-inconsolata at 10.0pt not loadable: Metric > (TFM) file n > ot found. > <to b...