Displaying 20 results from an estimated 1200 matches similar to: "Array as time series?"
2011 Jul 12
1
Cross K Ripley's function and "spatio-temporal interaction power"
Dear All,
I have a collections of spatial data. I have to analyze pairs of these
point patterns to test their spatial interaction. I was moving towards
the cross K Ripley's function. The problem, however, are the following:
1) What is the best way to get a single real value that represents the
interaction "power"?
2) How to obtain a value that even allows me to rank the pairwise
2001 Sep 10
3
Offline change detection methods?
Dear [R] people, I am looking for a method to test if there are any
changes (jump points) in a time series data set or not. If there are, I
would like to identify the jump points. All the data is available from the
beginning so an offline method could be used.
The current data set that I have could be seen as a time series with
five almost equally sized segments that stands out to have different
2006 Apr 04
2
EM algorithm
Dear R-Users,
I have a model with a latent variable for a spatio-temporal process.
I would like to use EM algorithm to estimate the parameters.
Does anybody know how to implement the algorithm in R?
Thank you very much in advance,
Michela
2004 Nov 16
3
memory allocation
Dear sirs,
I'm using the Splancs package to compute standard errors of the estimates of a
spatio-temporal k function.
When I use as spatial and temporal distances too long vectors (respectively 60
and 80 entries) for a dataset of 1000 observations, R gives me the message
Error: cannot allocate vector of size 180000 Kb
Reached total allocation of 512 Mb.
I ran the function memory.size()
2002 May 13
1
Spatio-temporal analysis of homicide rates
Dear R-listers,
I would like to carry out a very basic descriptive analysis of homicides
rates in Italy, taking into account both the spatial dimension (103
provinces) and the temporal dimension (10 years), but no covariates. In
practice, what I would like to do is to describe spatio-temporal variation
of homicide rates, identifying those combinations of province-year where
the homicide rate
2012 Jul 09
2
mfrow and centering plots when there's an odd number
Let me start with an example:
par(mfrow=c(2,3))
for (i in 1:5){
x = rnorm(100)
y = .5*x + rnorm(100, 0, sqrt(1-.5^2))
plot(x,y)
}
Note that there's five plots and six spaces for those plots via mfrow,
leaving one row empty. Is there a way to have the bottom two plots
centered? I think it looks weird to have them left-justified. Thanks in
advance for the help!
--
Dustin Fife
PhD
2006 Jun 15
1
SSPIR problem
Dear R-Users,
I'm using SSPIR package for a spatio-temporal application.
Is it possible to modify the structure of the involved matrixes (Fmat,
Gmat, Vmat,Wmat)?
I want to create a model like this
#y(t)=k*theta(t)+epsilon(t)
#theta(t)=h*theta(t-1)+eta(t)
#epsilon(t) N(0,V) V=sigma2*I
#eta(t) N(0,W) W=sigma2_eta
where the state variable theta has dimension 1(p=1) and at
2009 Jul 01
1
RScaLAPACK package with OpenMPI
Hi all,
I'm using RScalapack library for parallelizing some heavy matrix
operations required by MCMC methods for spatio-temporal models. The
package reference manuals (dated 2005) states that the library needs
LamMPI to work but we have a Linux Cluster with OpenMPI. We have found
(http://cvs.fedoraproject.org/viewvc/devel/R-RScaLAPACK/) a patch for
OpenMPI but we are wondering if in the
2017 Oct 06
1
How to resolve this error
> library(SpatioTemporal)
> library(plotrix)
> library(maps)
> palay.cov<-read.csv("C:/Users/BEDANA-PC/Desktop/STThesisWD/Thesis
Data/palay.covar.csv")
> palay.o<-read.table("C:/Users/BEDANA-PC/Desktop/STThesisWD/Thesis
Data/palay.obs.txt")
> palay.obs<-as.matrix(palay.o)
> palay.stc<-read.table("C:/Users/BEDANA-PC/Desktop/STThesisWD/Thesis
2008 Dec 10
1
subset point data set by distance ranges
Greetings
I'm using R 2.8 with recent (last month) versions of the packages I need to
use at present.
I'm interested in examining hierarchical spatio-temporal patterns in a data
set. The data consist of 94 points (X, Y, UTM coordinates) at which catch
rates for a fish were recorded and there are also estimates of prey
available for these fish at the same locations.
2013 Apr 08
1
Computational Ecologist Job at NOAA in Silver Spring, MD -- Marine Wildlife Spatial Modeling in R
The NOAA National Centers for Coastal Ocean Science is hiring a
Computational Ecologist, a statistical/computational ecologist with
experience fitting advanced spatial models to marine wildlife survey
data (e.g., seabirds and marine mammal transects, fisheries trawl
surveys) in R and other statistical languages. This is a full-time,
long-term stable contract position. We are looking for an
2005 Sep 14
1
Long lines with Sweave
I have used Sweave a lot the latest year, but never really used any long
function calls.
If I have code which look like this
-------------------------------------------------------------
gof <- benthic.flux(ID="Gulf of Finland",
meas.conc=conc,
bw.conc=bw.conc,
time=times,
2012 Oct 23
2
plotting multiple variables in 1 bar graph
I'd greatly appreciate your help in making a bar graph with multiple
variables plotted on it. All the help sites I've seen so far only plot 1
variable on the y-axis
Data set:
I have 6 sites, each measured 5 times over the past year. During each
sampling time, I counted the occurrences of different benthic components
(coral, dead coral, sand, etc.) over 5 transects in each site
site
2012 Jul 11
2
Modifying the design matrix X in GAMS to suit data assimilation
I have a data assimilation problem that might be amenable to the use of GAMS, but I am not sure how feasible it is to implement. I was told the R mailing list was a great resource.
My observations are spatiotemporal salinity in the San Francisco Bay at a number of instruments over a few days. The thing that I want to fit is the initial condition for a salt transport model at the beginning of this
2012 Oct 31
3
grep txt file names from html
Sorry, I know I should read a little 1st about this, but I am actually just
helping somebody really quick and need help too.
I want to grep all of the names of the .txt files mentioned on this html web
page:
http://www.epa.gov/emap/remap/html/three/data/index.html
Thanks ahead of time.
--
View this message in context:
2007 Dec 03
1
Plotting monthly timeseries with an x-axis in "time format"
I have the following timeseries "tab"
=====================================
> str(tab)
mts [1:23, 1:2] 79.5 89.1 84.9 75.7 72.8 ...
- attr(*, "dimnames")=List of 2
..$ : NULL
..$ : chr [1:2] "Ipex...I" "Omel...E"
- attr(*, "tsp")= num [1:3] 2006 2008 12
- attr(*, "class")= chr [1:2] "mts" "ts"
> tab
2011 Dec 20
2
any DCCA function in R?
Dear members,
I am performing multivariate analysis on marine benthic populations
using R. At first glance I found ca and VEGANO packages to be the
suitable for the task, but neither has incorporated Detrended Canonical
Correspondence Analysis (DCCA), which is just the method I want to apply
on my data. I've looked for alternative packages containing the method,
but my suspicion is that
2004 Oct 18
2
x is not a open/high/low/close time series
I am trying to create a high low close style chart but I keep getting the
following error statement; "x is not a open/high/low/close time
series". I've used the function is.ts and R responds TRUE but the
ohlcPlot function gives the above error statement. I'm actually planning
to plot some odds ratios with their confidence intervals and the
hi-low-close chart should do the
2017 Jun 08
2
Workspace en Rstudio
Estimados,
Les tengo una pequeña consulta.
Estoy trabajando con ASReml en Rstudio, me encuentro corriendo un modelo
(CHL) para obtener el ANOVA de la interacción de los factores gen x env
CHL<- asreml(fixed= MS~geno:env, random = ~rep, data = index) (interacción)
Sin embargo, cuando ejecuto el modelo, R indica que siguiente mensaje:
Current workspace: 128.000000Mb
Warning message:
Abnormal
2003 Apr 02
2
pacf.mts
I am getting the following:
*** Weave Errors ***
Error in driver$runcode(drobj, chunk, chunkopts) :
Error in eval(expr, envir, enclos) : couldn't find function "pacf.mts"
*** Source Errors ***
Error in eval(expr, envir, enclos) : couldn't find function "pacf.mts"
make[1]: *** [checkVignettes] Error 1
I don't really understand the new namespace mechanism,