similar to: Attempting to get a STELLA model into R

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

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;

Dear useRs, I have written an ecological model, based on the epidemiology SIR model. I've been trying 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:

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

In my pursuit of integrating samba password authentication with our own stuff, I've been looking at ways on synchronizing the two. And here are the two problems for which I hope to get either solution: a) smbpasswd will not pass down spaces to whatever is called for synchronization. Barely looking at the synchronization routine, it scans as a string, which would skip anything after a space.

Hey Bjorn, Were you able to figure this out or is it still broken for you? Our scenario is a little bit different, but I have a theory as to what may be going wrong. What linker are you using when you compile your project with clang-cl? I am wondering whether the version of the linker and/or the libraries that you are using is too old in comparison to the one used for the clang compilation.

Dear R experts, I would really appreciate if you had an idea on how to use more efficiently the aggregate method: More specifically, I would like to calculate the mean of certain values on a data frame,? grouped by various attributes, and then create a new column in the data frame that will have the corresponding mean for every row. I attach part of my code: matchMean <-

Hello Centos users! I'm doing a Centos 6 desktop oriented remix called Stella. This has been brewing since the summer and it's starting to get ready. :-) I've backported a lot of packages from Fedora and Rpmfusion and I bundle several other repos, too, resulting in a big range of software available, including but not limited to: LibreOffice, VLC, MPlayer, Shutter, Arista, Java,

Full_Name: Stella David Version: 2.1.0 OS: mingw32 Submission from: (NULL) (137.250.161.136) It seems that rank doesn't work right on vectors containing negative values. If the negative value is the first component or there are only two components, it works, but if the negative value is somewhere in the middle there's a problem. Here are my examples: > # wrong: > x<-

Dear all, This is the first time I am sending mail to the mailing list, so I hope I do not make a mistake... The last months I have been working on my MSc thesis project on performing data mining techniques on user logs of a software-as-a-service application. The main problem I am experiencing is how to process the huge amount of data. More specifically: I am using R 2.10.1 in a laptop with

Dear R experts, I have a question about the result of difftime() function: Does it take into account the different number of days in each month. In my example, I have the following: > firstDay [1] "2010-02-20" > lastDay [1] "2010-05-20 16:00:00" > difftime(lastDay,firstDay,units='days') Time difference of 89.625 days > When I count the days I get 88 days

Hello R Users, While I have attempted to dig into the R help files and I have not identified the answer to these questions, I apologize in advance if my questions were answered in the past. I also recognize that one of my questions unfortunately verges on statistical rather than code territory. I have two rather unrelated questions about using the sem and polycor packages for a relatively

Hi ! Is There how I use an alias for a Samba Server ? I tried with dns alias and don't work ! i.e. Name' Samba Server is PARATY, and I'd like that the workstations could communicate with this Samba Server, but using the name SambaPDC. Is it possible ? Thanks, Bruno Stella brunostella@trt15.gov.br Setor de Redes - Secretaria de Informatica Tribunal Regional do

Hello ! I have a Samba Server with LDAP(OpenLDAP) authentication and Windows Workstation that login in domain working all right. Now, I need to configure Linux workstations to log in Samba Server Domain. The Linux workstatios users are all in LDAP. How do I configure to execute the 'login script' when a Linux user log in his linux workstation ? Thanks for any help ! Bruno Stella

Hi, I wrote a function with three inputs fun(x,y,z). x is a matrix of three vectors combined with cbind. e.g. x1<-(1,2,3,4) x2<-(2,3,4,5) x3<-(3,4,5,6) x<-cbind(x1,x2,x3) y is a vector e.g y<-c(7,8,9) z is a real number e.g. z<-2.5 If a give the function an input like this, I get 'NA' in return. If I give the function a vector e.g c(1,2,3) instead of 'x'

Hi, How can a function in R handle different types of input? I have written a function, which should calculate the slope from several 3-time-point measurements by linear regression 4 three-time-point-measurements: x<-cbind(c(1,2,3,4),c(2,3,4,5),c(3,4,5,6)) time points: time<-c(1,3,9) function for calculating the slope by linear regression: fit<-function(xx,t){slope <-

Hello! I would like to do some tables for several variables and I would like to write a loop that does the table for each variable. I should also point out that my data set has several missing observations and sometimes the observations that are missing are not the same for all my variables. What I would like to do: table(StoreData$CompanyID, !is.na(StoreData$P2))

Dear list, I want to calculate SPE (squared prediction error) in x-space, can someone help? Here are my codes: fit.pls<- plsr(Y~X,data=DAT,ncomp=3,scale=T,method='oscorespls',validation="CV",x= T) actual<-fit.pls$model$X pred<-fit.pls$scores %*% t(fit.pls$loadings) SPE.x<-rowSums((actual-pred)^2) Am I missing something here? Thanks in advance. Stella Sim

Hi ! I'd like to know how does Samba delete files, because I need do something to instead Samba removes files, it moves the deleted files to another directory, like a Netware Salvage File or a Windows Trash Can. Thanks, Bruno Stella brunostella@trt15.gov.br Setor de Redes - Secretaria de Informatica Tribunal Regional do Trabalho da 15a. Regiao

Hi ! I have the follow problem: When I access a Shared Directory Samba3 by DOS, in win98 workstation and execute, for example, "dir file.txt", I receive an error message advising that occured a fault in access the drive ... I note this only when I execute the DOS command (del and dir) with the full file name, and only in win98 workstation, because in winXP workstation these