Displaying 20 results from an estimated 100 matches similar to: "About Torus Rndamiztion"
2008 Apr 12
2
nonlinear curve fitting on a torus
Dear R users.
I have data observed on the surface of a torus, and
am trying to fit the nonlinear regression using
the geodesic equation on a torus. Could anyone give
me a helpful advise on this problem? I would
definitely appreicate your reply.
Sincerely,
SUNGSU KIM
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2010 Jul 28
1
kde on Torus
Hello,
I have 2D-data on a torus, i.e. they are scattered within [0:2pi) and are
supposed to be periodic with period 2pi.
Is there a way in R for a kernel density estimation for such data? I found this
article http://www.dmqte.unich.it/personal/dimarzio/density46.pdf
but
a) I don't fully understand the article (my knowledge in statistics is poor)
b) I did not understand which Eq.
2015 Oct 31
5
Openvpn and samba: play nice together?
Friends--
I'm stumped! Cannot get mount.cifs to work over a tun connection. How
would you trouble-shoot this?
1. It cannot be openvpn causing the problem: I can ping across the
connection both directions on all machines.
2. It cannot be samba causing the problem: I can mount.cifs the smb
shares on the lan (using the identical credentials file) without any issue.
3. Have iptables
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
2005 Aug 03
1
help for cell2nb and queencell in spdep package
Dear Dr. Bivand and R-users,
I have a 5 by 5 grid, say, location[1:5,1:5], and I want to know the
indices of 8 neighbours of each cell. For example, for location[2,2], its
neighbour coordinates are [1,1:3], [2,1], [2,3] and [3,1:3]. Sometimes I
also need to remove edge effects (torus = TRUE).
I have tried "cell2nb" function in your spdep package. Here's my example:
> neigh
2008 Jul 18
1
system time - windows specific problem
Hi all,
I'm currently implementing quasi random generation (torus) on R
(package randtoolbox available on CRAN). Even if it is not a great
idea, I decided to use the machine time to initiate the seed. So when
the seed is not specified by the user, the pkg uses the time machine
time.
Hence the following R code should produce different uniform variates :
> for(i in
2007 Dec 25
2
VC2005 MMX patch.
Here is the patch with my changes.
Most work went into the decoder. I just changed on the encoder if
something was nessesary to build the library.
You can find the patch here (quite big)..
http://torus.untergrund.net/code/theora_mmx_vc2005.diff
Please let me know if the encoder works without problems. I just did a
very brief testing of it.
The decoder has been tested against the test
2010 Jan 19
3
Help ~
Dear Helper:
Thank you very much for your time on this question.
It is a little long and complicated.
Generate a clustered pattern in [0; 1]2 as follows:
(a) Generate n, say 20, independent cluster centers (which can be called parents) that are distributed i.i.d. uniformly in the unit square;
(b) then m,say 100, daughters are assigned i.i.d. uniformly to these parents and such that each
2015 Nov 02
0
Openvpn and samba: play nice together?
Hi,
this reminds me of my troubles of setting up samba BDC at remote company
branch.
Connection was done by IPSEC tunnel between 2 mikrotik routers.
Thing was, ipsec supports only unicast, but not multicast,nor broadcast.
Solved it by adding L2TP tunnel that support the above mentioned
mechanisms. So ended up with the l2tp (which has very weak encryption
and is very old and vulnerable)
2017 Nov 09
2
R-help
Generate a clustered pattern in [0; 1]2 as follows:
(a) Generate nc, say 20, independent cluster centres (which can be called
parents) that are distributed i.i.d. uniformly in the unit square;
(b) then n daughters are assigned i.i.d. uniformly to these parents and
such that each daughter is located i.i.d. uniformly in a disk of radius r =
0:1 centred at her parent, under the periodic boundary
2008 Feb 15
1
Conditional Autoregressive (CAR) model simulation
Hi all !
I would like to simulate spatial lattice/areal data with a conditional
autoregressive (CAR) structure, for a given neighbouring matrix and for a
autocorrelation "rho".
Is there any package or function in R to perform it ?
I found the function "CARsimu" in the hdeco library, but this is not what
I'm looking for
Thanks in advance
Dae-Jin
--
2010 Jun 20
3
Spatial: number of independent components?
Hi all, I am sorry if this is a very basic quesion, but I have no experience
with analyzing spatial data and could not find the right function/package
quickly. Any hints would be much appreciated. I have a matrix of spatial
point patterns like the one below and want to find the number of independent
components (if that's the right term) in that matrix (or in that image).
x=matrix(c(0,1,0,0,0,
2012 Dec 04
3
Read.csv
Hi list,
I am using read.csv to read data from csf files, but noticed that the
numeric data (those larger than 10 power 9) are rounded to the nearest
million (10 power 6). Any solution?
Thanks
Arvin
--
Sent from my mobile device
2017 Nov 09
0
R-help
Hi
it smells like a homework, this list has no homework policy.
Anyway, maybe the sample approach could be used.
Generate x,y coordinates - ?expand.grid
sample n centers - ?sample
select all points within defined area - ?point.in.polygon, package sp
select desired number of points - ?sample
Cheers
Petr
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org]
2009 Apr 20
4
graph with 15 combinations
Dear R helpers,
I have a data set with 4 types (W, C, E & S). Now I have values for all
types plus all possible combinations (the order is unimportant): W, C,
WC, E, WE, CE, WCE, S, WS, CS, WCS, ES, WES, CES & WCES. Ideally I would
like to represent everything in one graph and as concise as possible.
Drawing 4 circles and depicting it as overlap just gives me 13 out of
the 15
2008 Feb 28
0
New Package: geozoo. High-Dimensional Geometric Objects
Dear useRs,
I'd like to announce a new package called geozoo, short for geometric
zoo. It's a compilation of functions to produce high-dimensional
geometric objects, including hypercubes and hyperspheres, Boy's
surface, the hyper torus and a selection of polytopes. For a complete
list, as well as images and movies, visit
2012 Jul 12
0
How to handle NA-values in raster-based Geary´s C test?
Hi,
I have a question on testing spatial autocorrelation on raster data
including NA-values. In particular, I like to calculate Moran?s I and
Geary?s C indices by using inverse distance weighting matrices.
Calculating Moran?s I with moran.test works fine, because the function
contains the option "na.action=na.pass". Unfortunately, the function
geary.test does not contain this
2012 Nov 15
1
problem with XML package
Hi List,
I have used XML in R version 2.9.2. The code is working fine using Rv2.9.2
and its related XML package. Now I am using Rv2.13.1 and its related XML
package, but I get the following error:
Error in UseMethod("xmlName", node) :
no applicable method for 'xmlName' applied to an object of class "NULL"
Any idea?
Thanks
Arvin
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2007 Dec 30
2
Patch: fragment reconstruction MMX for GCC
Hi again,
I measured my fragment reconstructions against the compiler output from
GCC and well - the new codes perform better, so I brushed up my gcc
inline assembler skills and made a port.
Code is here: http://torus.untergrund.net/code/mmxfrag.c
All routines perform much better now. Inter2 alone got a speedup of
factor 5 on Pentium-M. Athlon CPU's execute roughly 3 times faster.
2008 Apr 26
6
quasi-random sequences
Dear list useRs,
I have to generate a random set of coordinates (x,y) in [-1 ; 1]^2
for say, N points. At each of these points is drawn a circle (later
on, an ellipse) of random size, as in:
> N <- 100
>
> positions <- matrix(rnorm(2 * N, mean = 0 , sd= 0.5), nrow=N)
> sizes<-rnorm(N, mean = 0 , sd= 1)
> plot(positions,type="p",cex=sizes)
My problem is to