search for: simecol

Hi there, I´m trying to use "simecol" package but I got the error showed below. I´m runnig R version 2.4.0 (2006-10-03). Kind regards, miltinho Brazil --- > require(simecol) Loading required package: simecol Error in loadNamespace(package, c(which.lib.loc, lib.loc), keep.source = keep.source) : in ...

Dear useRs, a new and completely re-worked version of the "simecol" package SIMulatiion of ECOLogical (and other) dynamic systems is now available on CRAN. Compared to the S3 based 0.2-x versions an improved object model using S4 classes was employed. Please ask me for assistance in case of incompatibility. Comments are welcome, Thomas Petzoldt -------...

Dear useRs, a new and completely re-worked version of the "simecol" package SIMulatiion of ECOLogical (and other) dynamic systems is now available on CRAN. Compared to the S3 based 0.2-x versions an improved object model using S4 classes was employed. Please ask me for assistance in case of incompatibility. Comments are welcome, Thomas Petzoldt -------...

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hey can anybody help me? i have to simulate the richardson Arms race model on R.. for my simulation class...

Do anyone know anything about the use of R for agent-based social simulation? It should be possible, and would be convenient for the simple reason that there are several nice packages containing useful stuff for SNA (Social Network Analysis). Information about packages, web sites, experienced persons in the field, etc. would be very welcome. Tom

Hello all, I discovered that the pdf device uses fonts to represent "points" symbols (as in plot(...,type="p",...) ). Namely it uses ZapfDingbats with symbol U+25cf. This can lead to problems when the font is not available, or available in another version (such as points being replaced by other symbols, or worst: slightly displaced). Furthermore, it also causes

I was at a lecture the other day and I saw a presentation of very neat (short) animation modeling epidemic disease spread over a map region. When I ask what software they used they mentioned SAS. Do you know if there are equivalent resources in R to model the spread of disease with animation output? My search in R-help and google didn't lead to any document (though I found a couple of

....g. #includd <cmath> NOT #include <math.h> Symptoms of this can be seen for packages BayesTree EMCC MCMCfglmm MarkedPointProcess Matching Matrix RQuantlib RandomFields Rcpp SoPhy compHclust dpmix igraph minet mixer modeest monomvm multic pcaPP rgenoud robfilter segclust simecol subselect -- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK...

I'm fairly new to R, and I'm trying to write out a population model that satisfies the following; the system consists of s species, i= 1, 2,...,s network of interactions between species is specified by a (s x s) real matrix, C[i,j] x[i] being the relative population of the "ith" species (0 =< x[i] =< 1, sum(x[i]=1) the evolution rule being considered is as follows;

Hi, I was wondering if anyone knows of a package that contains the ability for peak/valley detection. Here is an example of what I'm looking for, only problem is that it's written in Matlab. http://www.billauer.co.il/peakdet.html Thanks for any help in advance. -Joe

...lopers, I recently observed a NOTE on several MaxOS X package checks: sh: line 1: gs: command not found !!! Error: Closing Ghostscript (exit status: 127)! /usr/bin/texi2dvi: thumbpdf exited with bad status, quitting. See for details: http://www.r-project.org/nosvn/R.check/r-release-macosx-ix86/simecol-00check.html or http://www.r-project.org/nosvn/R.check/r-release-macosx-ix86/fxregime-00check.html Does anybody know what's wrong here? Thanks a lot Thomas Petzoldt -- Thomas Petzoldt Technische Universitaet Dresden Institut fuer Hydrobiologie thomas.petzoldt at tu-dresden.de 01...

Hello! I'm interested to fit parameters (to data) in a grid-based (individual) model. If I understood well, simecol library has the fitOdeModel function but it is only suited to odeModels (differential equation). Alternatively, FME package has several functions able to perform this procedure but all examples are for differential eq. models. It is mentioned in the that such functions could also be used for other...

To whomever may be of help, I am a student in a graduate modeling class at the University of North Carolina at Wilmington. I am trying to get a STELLA model converted into R. I am in the process of trying to 're-write' the script into R, but I seem to be missing pieces (i.e. parm values) that are keeping me from being able to replicate this model into R. Does anyone have an idea of a

...rying to simulate it in R. However, I can't simulate it properly. Two guesses: my script isn't right; I'm not setting the parameters properly I have uploaded an image to the model here: http://img24.imageshack.us/img24/743/imagemutr.jpg The script I am using is as it follows: require(simecol) mod1 <- new("odeModel",   main = function(time, init, parms) {   x <- init   p <- parms     dx1 <- p["K"] - p["alpha"]*x[1]*x[2] - p["gamma"]*x[1]     dx2 <- x[1]*x[2]*(p["alpha"] - p["beta"])     dx3 <- p["beta&qu...

Dear R-users, I am currently modifying a previously developed predator prey model and was curious if there was a way to add in a disturbance to the model (let's say at time t=100). The disturbance can be the introduction of 40 prey (N=40) and 10 predators (Pred = 10). I would like to see my model go from a state of equilibrium (up to t = 99), show this disturbance (at t = 100) and then

Hello, I want to know if there are some functions or packages to solve differential and integral equation using R. Thanks. Shao chunxuan. [[alternative HTML version deleted]]

...ould like to calculate the phase value for each peak. It would be great to calculate the mean value for the peak (possibly using rollmean(), but given the low variability within the broad peak even just picking one value from the peak would be sufficient. I have tried using peaks() from the library(simecol), peaks(data$Time,data$phase, model="max"), but because of the flat nature of the peaks and the fact that peaks() looks for values with lower neighbors I am unable to find all the peaks (especially the one between time 0.762-0.897). For all my data files the maximum phase values will fa...

...inf and Ktaum The E (reversal potential) values for all the channels are given, except for CaT and CaS which uses Eca as calculated in (5). Current for Ca is calculated by summing the CaT and CaS currents, hence CaI = gCaT*CaTm^3*CaTh*(v-Eca(v)) + gCaS*CaSm^3(v-ECa(v) Here is the code: library(simecol) ## Hodkin-Huxley model HH_soma <- function(time, init, parms) { with(as.list(c(init, parms)),{ # Na only used in Axon #Naminf <-1/(1+exp(-(v+24.7)/5.29)); #Nataum <- function(v) 1.32 - (1.26/(1+exp(-(v+120)/25))); #Nahinf <-1/(1+exp((v+489)/5.18)); #Natauh <-...

...mistakes (some PDF errors are already known). On the other hand, I would be very glad about remarks and constructive criticism. The tutorial can be found on http://www.tu-dresden.de/fghhihb/petzoldt/zeugs.html together with an absolutely preliminary version of an accompanying library (the name simecol may be changed soon). Thank you for your feedback! Many thanks to all the people who are making the R-project possible! Thomas -- Thomas Petzoldt Tel. +49-351-463 3 4954 Dresden University of Technology Fax +49-351-463 3 7108 Institute for Hydrobiology petzoldt at...