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...fferent? The result would be expected to be somewhat different, as setting importance=TRUE would make many calls to the random number generator (for permuting OOB data in each variable), making all but the first tree in the forest different than if importance=FALSE. Cheers, Andy > From: Scott Gilpin > > Hi - > > When using the randomForest function for regression, I get different > results for mean-squared error of the predictions depending on whether > or not I specify to calculate variable importance. There is an > example below. I looked briefly at the source code,...

...by default. If that's the difference, perhaps it's sufficient to explain the performance difference. The other thing is that solve(), and to some extent lm(), can benefit from an optimized BLAS. You might want to check if the two builds are using equivalent BLAS. Andy > From: Scott Gilpin > > Hi everyone - > > I'm seeing a 32-bit build perform significantly faster (up to 3x) than > a 64 bit build on Solaris 8. I'm running R version 2.1.0. Here are > some of my system details, and some resulting timings: > > >uname -a > SunOS lonetree 5.8 Ge...

...the source code, but couldn't find anything that would indicate why calculating variable importance would (or should) change predictions. I'm using randomForest version 4.3-3 (the latest from CRAN), and tried R 1.9.0, 1.9.1 and 2.0.0 on Windows XP, and R 1.9.1 on solaris 8. Thanks, Scott Gilpin library(randomForest) set.seed(2863) x<-matrix(runif(1000),ncol=10) colnames(x)<-1:10 beta<-matrix(c(1,2,3,4,5,0,0,0,0,0),ncol=1) y<-drop(x %*% beta + rnorm(100)) newx<-matrix(runif(1000),ncol=10) newy<-drop(newx %*% beta + rnorm(100)) set.seed(2863) rf.fit <- randomForest(x=...

Hi, I a currently running a server which is using uw-imap server which currently has 190 users. I am looking to move the server OS and the imap server to Dovecot Imap Server. We are currently using mbox as the default mail file. I have a couple of questions to ask. 1) Would it be better if we moved to maildirs during the server move? 2) All current mail files are in a directly called

...about enclosing and parent environments, but this leads me to belive that step is doing the right thing. I've tried this code with R version 1.9.0, 1.9.1 and 2.0.0 on Windows XP. The error message is slightly different for 2.0.0, but it seems to be the same problem. Thanks in advance, Scott Gilpin ## Example code rm(list=ls()) ## Forward stepwise regression - works fine set.seed(2863) x<-matrix(runif(1000),ncol=10) colnames(x)<-1:10 beta<-matrix(c(1,2,3,4,5,0,0,0,0,0),ncol=1) y<-drop(x %*% beta + rnorm(100)) lsdata<-data.frame(cbind(x=x,y=y)) xnam <- names(lsdata)[name...

Dear all, One of my students (whom I am trying to convince to use R) wants to get a fairly large SAS dataset into R (about 150mB). An obvious and simple thing she tried was to write the dataset as a .csv-file and then read that into R, but that takes forever (or something close to that..). The dataset is so large, that exporting it as an Excel file from SAS is not feasible (more than 65000 lines).

...#39;m seeing a 32-bit build perform significantly faster (up to 3x) than a 64 bit build on Solaris 8. I'm running R version 2.1.0. Here are some of my system details, and some resulting timings: >uname -a SunOS lonetree 5.8 Generic_117350-16 sun4u sparc SUNW,Sun-Fire-V440 lonetree /home/sgilpin >gcc -v Reading specs from /usr/local/lib/gcc/sparc-sun-solaris2.8/3.4.2/specs Configured with: ../configure --with-as=/usr/ccs/bin/as --with-ld=/usr/ccs/bin/ld --disable-nls Thread model: posix gcc version 3.4.2 I built the 32 bit version of R with no changes to config.site. I built the 64 bi...

Hello everyone - I have a couple of questions about memory management of large objects. Thanks in advance for your response. I'm running R version 1.9.1 on solaris 8, compiled as a 32 bit app. My system has 12.0 GB of memory, with usually ~ 11GB free. I checked system limits using ulimit, and there is nothing set that would limit the maximum amount of memory for a process (with the

I have been using some components that render links to actions within themselves. For example a Lens::MatrixController outputs: <%= link_to format, { :controller=>''/lens/matrix'', :action => ''choose_format'', :format => format }, { :class => "styledA" } %> This was working fine until I upgraded to 1.1.6 after seeing the security