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...egards, IOsu -------------------------------------------------------------- Jes?s Mar?a Fr?as Celayeta Dublin Institute of Technology School of Food Sci. and Env. Health. Cathal Bruha St., Dublin 1. Ireland Phone: +353 1 4024459 Fax: +353 1 4024495 http://www.dit.ie/DIT/tourismfood/science/staff/frias.html -------------------------------------------------------------- -- This message has been scanned for viruses by the DIT Computer Centre MailScanner Service, and is believed to be clean.

...----------------------------------------------------------- Jes??s Mar??a Fr??as Celayeta School of Food Sci. and Env. Health. Faculty of Tourism and Food Dublin Institute of Technology Cathal Brugha St., Dublin 1. Ireland t +353 1 4024459 f +353 1 4024495 w www.dit.ie/DIT/tourismfood/science/staff/frias.html -------------------------------------------------------------- -- This message has been scanned for content and viruses by the DIT Information Services MailScanner Service, and is believed to be clean. http://www.dit.ie

...----------------------------------------------------------- Jes??s Mar??a Fr??as Celayeta School of Food Sci. and Env. Health. Faculty of Tourism and Food Dublin Institute of Technology Cathal Brugha St., Dublin 1. Ireland t +353 1 4024459 f +353 1 4024495 w www.dit.ie/DIT/tourismfood/science/staff/frias.html -------------------------------------------------------------- -- This message has been scanned for content and viruses by the DIT Information Services MailScanner Service, and is believed to be clean. http://www.dit.ie

...th, Coláiste Eolaíochtaí agus Sláinte/ College of Sciences and Health, Institiúid Teicneolaíochta Átha Cliath/ Dublin Institute of Technology, Sráid Chathal Brugha, Baile Átha Cliath 1, Éire/Cathal Brugha Street, Dublin 1, Ireland F: +353-1-4024459 E: <mailto:james.curtin@dit.ie> jesus.frias@dit.ie W: http://fseh.dit.ie/o4/StaffListing/JesusFrias.html Tá an teachtaireacht seo scanta ó thaobh ábhar agus víreas ag Seirbhís Scanta Ríomhphost de chuid Seirbhísí Faisnéise, ITBÁC agus meastar í a bheith slán. http://www.dit.ie This message has been scanned for content and viruses...

Last week (Wed 9/10/2003, "regression questions") I posted a question regarding the use of gnls( ) and its dissimilarity to the syntax that nls( ) will accept. No one replied, so I partly answered my own question by constructing indicator variables for use in gnls( ). The code I used to construct the indicators is at the end of this email. I do have a nagging, unanswered

Dear all, Has anyone written functions to compute (and ideally project / plot onto a plane) confidence ellipsoids for q linear model parameters, q > 2 ? Greetings and best wishes, Renaud -- Dr Renaud Lancelot, v?t?rinaire CIRAD, D?partement Elevage et M?decine V?t?rinaire (CIRAD-Emvt) Programme Productions Animales http://www.cirad.fr/presentation/programmes/prod-ani.shtml ISRA-LNERV

Dear R-helpers, I need some help to produce a set of contour plots that I am trying to make in order to compare surfaces between the levels of a factor. For example: library(lattice) g <- expand.grid(x = 60:100, y = 1:25, ti = c("a","b","c")) g$z <-with(g, (-1e-4*x-1e-3*y-1e-5*x*y)*(ti=="a") + (1e-2*x-1e-3*y-1e-4*x*y)*(ti=="b") +

> Date: Thu, 10 Aug 2000 15:33:39 -0700 > From: Jesus Maria Frias Celayeta <iosu at bureau.ucc.ie> > > hi R-help! > > I would like to know a simple and easy way (if posible) to do the following > data manipulation. I have a matrix of experimental data (with replicae in time) actually, they seem to be data frames. > > >ex...

...----------------------------------------------------------- Jes??s Mar??a Fr??as Celayeta School of Food Sci. and Env. Health. Faculty of Tourism and Food Dublin Institute of Technology Cathal Brugha St., Dublin 1. Ireland t +353 1 4024459 f +353 1 4024495 w www.dit.ie/DIT/tourismfood/science/staff/frias.html -------------------------------------------------------------- -- This message has been scanned for content and viruses by the DIT Information Services MailScanner Service, and is believed to be clean. http://www.dit.ie

...-------------------------------------------------------------- Jes?s Mar?a Fr?as Celayeta School of Food Sci. and Env. Health. Faculty of Tourism and Food Dublin Institute of Technology Cathal Brugha St., Dublin 1. Ireland t +353 1 4024459 f +353 1 4024495 w www.dit.ie/DIT/tourismfood/science/staff/frias.html -------------------------------------------------------------- -- This message has been scanned for content and viruses by the DIT Information Services MailScanner Service, and is believed to be clean. http://www.dit.ie

I've been looking at the ellipse package I co-wrote with Ed Chow for S-Plus a few years ago, cleaning up the documentation now it's been ported to R (by Jesus Frias, thanks IOsu!) and I'm back as the maintainer. One of the things it did which we thought was kind of cute at the time was to use a few lines of Postscript code to define a font, where the glyphs were ellipses of various shapes, used in the plotcorr function to display big correlation matrices...

Hi R-helpers! I have a problem with the xfig device and I don't know how to tackle. If anybody can give me some help I will be very thankful: *I have produced a series of figures using a function that makes a call to barplot (in fact I am making Pareto Charts using a function that was kindly provided through this list :-) *I have exported the figures to xfig in order to give them a

I got a question from a fellow PhD student that work with spectrum analysis in Excel and now he has lots of spectrums that needs to be smoothed, which would be nice to be able to do in batch. Is there an R package that can do: Savitzky-Golay smoothing for reflectance spectral data or a function that does something similar. _______________________________________ Henrik Andersson

hi R-help! I would like to know a simple and easy way (if posible) to do the following data manipulation. I have a matrix of experimental data (with replicae in time) >experiment<-data.frame(times=c(0,0,10,10,20,20,30,30),expval=c(1,1,2,2,3,3,4,4)) > experiment times expval 1 0 1 2 0 1 3 10 2 4 10 2 5 20 3 6 20 3 7 30 4 8

I'm written a function that uses nls in a loop to fit a model to resampled data. Occasionally a sample is drawn such that the algorithm (apparently) can't converge and step factor reduced below minimum is printed to the screen. I tried a few different settings for the minFactor parameter in nls.control with no different result. When this happens, I would like my function to put NAs

Forgive this naive question, but I'm not accustomed to using Win ports of Unix tools (actually I'm unfamiliar with Unix tools, period). Anyway, I've successfully compiled the R-1.1.1 sources into the full binary package. Everything seems to work. I'd like to remove all the "made" files and leave only the original source code and the compiled binary code. Is there

Hi there, I'm trying to fit a growth curve to some data and need to use a weighted least squares estimator to account for heteroscedasticity in the data. A weights argument is available in nls that would appear to be appropriate for this purpose, but it is listed as 'not yet implemented'. Is there another package which could implement this procedure? Regards, Robert Brown

A couple of months ago I downloaded R 1.6.0's binary for Windows, which I have since been using without any particular problem, that is on one machine running Windows 98. Last week I set up a local network and have since tried to use R remotely, i.e. R is installed on the previous machine and nowhere else. On the client's side, the GUI opens correctly and allows me to do simple

Dear R-experts I would like to read all files from a directory, the files have names "myname0001.txt" etc. I paste the directory plus file names and use "read.delim()". My problem is that some file names are missing, so I get an error and my program stops. Is there a way to check for a null pointer analogous to C, so that I can simply skip non-existent filenames? Please do

Dear Colleagues, Our group is also working on implementing the use of R for pharmacokinetic compartmental analysis. Perhaps I have missed something, but > fit <- nls(noisy ~ lsoda(xstart, time, one.compartment.model, c(K1=0.5, k2=0.5)), + data=C1.lsoda, + start=list(K1=0.3, k2=0.7), + trace=T + ) Error in eval(as.name(varName), data) : Object