similar to: Exporting Nuopt from splus to R

From: Prof Brian Ripley [mailto:ripley at stats.ox.ac.uk] > On Wed, 28 Nov 2001, Janusz Kawczak wrote: > > > R-users and R-developers: > > > > do you know of any package in R (or for R) that can perform optimizations > > for a linear and non-linear systems? I am aware of the NUOPT module in > > S-Plus that provides an optimizer engine to do just that and more.

Does anyone know whether R has its own modeling language for optimization problems (like SIMPLE in NuOPT for S-plus)? Paolo

Does anyone know if the lmer function of lme4 works fine for unbalanced designs? I have the examination results of 1000 pupils on three subjects, one score every term. So, I have three scores for English (one for every term), three scores for maths etc. However, not everybody was examined in maths, not everybody was examined in English etc, but everybody was in effect examined on four subjects. I

Dear all, I am a relative newcomer to the R language, and am sussing out the possibilities of using R to do integer programming (which I am also new to). Is there something along the lines of the NUOPT S- PLUS package that is available, or on the way, for R? Are there other options for integer programming in R? Thanks very much in advance, Robin Naidoo University of Alberta Edmonton, AB,

SQldf with sqlite and H2 I have a large csv file (about 2GB) and wanted to import the file into R and do some filtering and analysis. Came across sqldf ( a great idea and product) and was trying to play around to see what would be the best method of doing this. csv file is comma delimited with some columns having comma inside the quoation like this "John, Doe". I tried this first

Hello, I've had a quick look on the list and can't find an answer to this niggle. Whilst debugging some code, I noticed that looping variables in R are not local to the loop as seams common in procedural languages. For example consider the following piece of code: for(i in 1:3){ cat(i,"") for(i in c("a","b","c")){ cat(i,"")

Dear list members, I am trying to get information on how to fit a linear regression with constrained parameters. Specifically, I have 8 predictors , their coeffiecients should all be non-negative and add up to 1. I understand it is a quadratic programming problem but I have no experience in the subject. I searched the archives but the results were inconclusive. Could someone provide suggestions

Hello list, I am dealing with a noisy function (gradient,hessian not available) with simple boundary constraints (x_i>0). I've tried constrOptim() using nelder mead to minimize it but it is way too slow and the returned results are not satisfying. simulated annealing is so hard to tune and it always crashes R program in my case. I wonder if there are any packages or functions can do

Hi all, I have Splus and R both on my unix machine. I intend to keep only one of them. R looks to be a better choice. But I want to confirm. Is there any function or group of functions in Splus that are absent in R? Thanks, Saket. -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send

Can someone help me understand the following: > D(expression(dnorm(x, mean)), "mean") [1] 0 > sessionInfo() R version 2.2.1, 2005-12-20, i386-pc-mingw32 attached base packages: [1] "methods" "stats" "graphics" "grDevices" "utils" "datasets" [7] "base" By my computations, this should be

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I'm trying to get a translation of some Splus code going. My problem is with the S-plus get.message() function not existing in R. Is there a replacement or alternative? ErrorHandler.func<-function() { cat("app.terminated\n"); cat(paste("err.fatal",get.message(),"\n",sep="")); dump.calls(); } options(error=ErrorHandler.func)

Dear, R experts. I have two program codes, one is made by Splus and the other is made by transferring from Splus code. Because "nlminb" function in Splus is equivalent to "optim" in R, I expected to get exactly same result. But, sometime there is too large differece (greater than 2%) between two outputs. I looked two help files. According to those, in Splus, quasi-Newton

Dear R-help, Does anybody know where can I find R/Splus code for computing PREdiction Sum of Squares (PRESS) in a linear regression model? I have a large regression model (~100 predictors, ~30,000 cases) and good prediction is the main goal. I remember there is a faster way to compute it (no need to repeatedly fit models), but if there is existing code...... Thanks. Mai Z

Dear R-gurus, Is there any function in R does the same thing as function subplot()in Splus? I am trying to post a pie chart onto the top right hand corner of existing bar chart. Also, Does anyone know if I can use paste() to paste the graph to another graph? Cheers, Carla Chen

Anyone I'm wondering how to make confidence intervals (bonferroni or simultaneous) when using Manova and Mancova in Splus. I 'm doing manova with four variables on length and four variables on weight (of salmon). The measuring is done on different time points. I'm working on my master in the field between biostatistics and fishery biology. If anyone knows a good book on mancova

Hello, Is it possible with R to recover the contents of SPlus GraphSheets (*.sgr) without access to SPlus? Also, some of the .sgr files may have multiple pages. Thanx, DaveT. ************************************* Silviculture Data Analyst Ontario Forest Research Institute Ontario Ministry of Natural Resources david.john.thompson at ontario.ca http://ofri.mnr.gov.on.ca

If there something available in R that has the functionality of the S-PLUS peaks() function? Thanks, Mirka