Displaying 20 results from an estimated 300 matches similar to: "maybe use voronoi.findrejectsites?"
2010 Dec 16
0
Convert tileplot's trellis to shapefile/ Add values to voronoi polygon
I would like to create a voronoi map that can show me point values like the
ones in colum street_cle. I was able to do it in tileplot(latticeExtra) like the
ones attached, and with the following commands:
xy=list(x=x2$X, y=x2$Y)
xy$street_cle <- x2$street_cle
tileplot(street_cle~ x*y, xy)
But this is a trellis. Is it possible to be converted to a shapefile or image so
I can plot it using
2001 Apr 14
0
How to create polygons from voronoi objects in tripack?
Hello.
I'd like to convert voronois object created by tripack to polygons to use
them in GIS(Geographic Information Systems) software. I tried to create
voronoi objects by using following code.
> library(tripack)
> x <- rnorm(10)
> y <- rnorm(10)
> plot(x,y)
> v<-voronoi.mosaic(x,y)
> plot(v)
But from here, I could not create polygons.
Of course, I know
2008 Feb 07
1
Voronoi
Hello everyone
I have a problem with tripack package, I want to perform a Voronoi
tessellation on a specific domain (I have the shape file), in order to
weight my climatic data with the area ... How Can I do it?
Thank you very much
Andrea
2011 Feb 24
1
weighted Voronoi diagrams
Dear R-users,
Does anyone know how to do weighted Voronoi diagrams (Dirichlet
tesselation) in R? To be more specific, I have a set of coordinates for
tree locations on a plot, and I'm looking for a way to do the
tesselation 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
2007 Nov 27
1
voronoi/Delaunay/Dirichlet tessellation on sphere in R or S?
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,
2008 Nov 03
2
Cómo convertir un objeto data frame en una tabla csv
Agradeceré me ayuden con la consulta:
Cómo convertir un objeto data frame en una tabla csv que pueda a su vez ser
convertida en un objeto geodata
De antemano, gracias por la atención,
--
Ricardo Bandin Llanos
rbandin@udec.cl
Estudiante - Magíster Cs. m. Pesquerías
Universidad de Concepción, Región del Bio-Bio, Chile
Celular: (0056-41) 97949957
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2005 Nov 13
4
voronoi
Is there any pure r code to do delaunay or voronoi diagrams?
Thanks!
---------------------------------
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2004 Aug 31
0
N-dimensional delaunay tesselation & voronoi diagrams
Hi,
I've been looking for functions that can do delaunay tesselation and
generate voronoi cells. I came across deldir and tripack but both seem
to be restricted to 2D points. Are there any packages that can do a
tesselation in N dimensions? I know that Matlab and Mathematica use the
qhull package to provide functions for this. Does anybody know of any R
packages that do this (maybe by calling
2007 May 09
1
voronoi.mosaic chokes?
Hi all,
I am running R 2.5.0 under Windows XP Media Center Edition. Here's a
problem that's been stumping me for a few days now, and I can't find
anything useful in the archives. I am using voronoi.mosaic (tripack
package) to create proximity polygons for a study of vegetation
competition and dynamics. The points lists are read in from a file for
each plot, then 8 duplicates
2006 Apr 06
1
rounding of voronoi vertices using deldir()
Hello list,
I'm 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
2006 Jul 19
2
voronoi tessellations
Okay, been working with tripack, seems the most mature package for this. Got it to work well with their test data set - data(tritest). When i tried random numbers to explore further, i am getting some results that don't reconcile.
example run this:
library(tripack)
y <- runif(100)
x <- runif(100)
vm <- voronoi.mosaic(x,y)
plot(vm)
par(new=T)
plot(x,y,col='blue')
when
2007 Jul 08
2
Making Gehan-Breslow test for Survival data
Hi all,
The survivals functions can be tested by the Log-rank test and others, for
example the Gehan-Breslow. The graham breslow work with the alpha values.
But I don't know how is the Gehan-Breslow test with R. Somebody know a
type function?.. or other suggestions? Any help will be really
appreciated
Jos? Bustos
Marine Biologist
Master Apllied Stat Program
University of Concepci?n
2001 Aug 19
1
Fw: RE:Contact RCA Feature Definitions and their Use Lyra [#1253989]
I contacted RCA Customer Service e-mail asking about Vorbis support for Lyra
and I got this back. Doesn't even seem like they read it...
----- Original Message -----
From: <contactus@rca.com>
To: <getchoo52@hotmail.com>
Sent: Friday, August 17, 2001 11:41 AM
Subject: RE:Contact RCA Feature Definitions and their Use Lyra [#1253989]
>
> Dear Customer:
>
> Thank you for
2012 Jan 08
2
R package equivalent to Excel SOLVER - Paquete R equivalente a SOLVER de Excel
Esteemed colleagues
I wonder if there is a package in R that performs the functions of the
Excel SOLVER.
Thanks in advance for the reply.
Best regards,
-------------------------
Estimados colegas
Me pregunto si hay un paquete en R que funcione como el SOLVER de Excel.
De antemano gracias por la respuesta.
Saludos,
--
Ricardo Bandin Llanos
rbandin@udec.cl
[c] Magíster Cs. m. Pesquerías
2008 Nov 17
2
How to calculate the linear distance between 2 points
Deemed colleagues
I would appreciate your help with a sentence to calculate the linear
distance between 2 geographical points (coordinates in UTM).
In advance thnks for your attention,
--
Ricardo Bandin Llanos
rbandin@udec.cl
Estudiante - Magíster Cs. m. Pesquerías
Universidad de Concepción, Región del Bio-Bio, Chile
Celular: (0056-41) 97949957
[[alternative HTML version deleted]]
2015 Jul 15
2
bquote/evalq behavior changed in R-3.2.1
David,
If you are referring to the solution that would be:
rapply(list(test), eval, envir = fenv)
I thought I explained in the question that the above code does not work. It
does not throw an error, but the behavior is no different (at least in the
output or result). Using the above code still results in the x object not
being stored in fenv on 3.1.2.
Dayne
On Wed, Jul 15, 2015 at 4:40 PM,
2015 Jul 15
3
bquote/evalq behavior changed in R-3.2.1
In 3.1.2 eval does not store the result of the bquote-generated call in the
given environment. Interestingly, in 3.2.1 eval does store the result of
the bquote-generated call in the given environment.
In other words if I run the given example with eval rather than evalq, on
3.1.2 "x" is never stored in "fenv," but it is when I run the same code on
3.2.1. However, the given
2015 Jul 15
2
bquote/evalq behavior changed in R-3.2.1
On Jul 15, 2015, at 12:51 PM, William Dunlap wrote:
> I think rapply() was changed to act like lapply() in this respect.
>
When I looked at the source of the difference, it was that typeof() returned 'language' in 3.2.1, while it returned 'list' in the earlier version of R. The first check in rapply's code in both version was:
if (typeof(object) != "list")
2008 Jun 11
7
applying a function recursively
Hi,
I have a question about applying a function recursively through a
list. Suppose I have a list where the different elements have
different levels of recursion:
> test.list<-list("I"=list("A"=c("a", "b", "c"), "B"=c("d", "e", "f"), "C"=c("g", "h", "i")),
+
2014 Apr 14
2
[LLVMdev] LLVM 3.4.1 - Testing Phase
On 04/14/2014 02:31 PM, Arnaud Allard de Grandmaison wrote:
> Hi All,
>
> As kindly pointed by Sebastian, please forget my point about the release
> script. I read the mail from Tom 2 days ago, and forgot that the script was
> available in the tag / branch when I acted today :(
>
> I uploaded clang+llvm-3.4.1-rc1-x86_64-unknown-ubuntu12.04.tar.xz to
> ftp.llvm.org.
>