similar to: auto-loading package possible?

Dear R-devel, I'm encountering a strange problem in a Rd file that I'm working on. In the "Value" section, I have something like: ===================== \value{ An object of class \code{randomForest}, which is a list with the following components: \item{call}{the original call to \code{randomForest}} ... For classification problem, the following are also included:

With the same system configuration (WinNT4 SP6 and 1.7.0), I get such a Dr Watson crash each time I try to use the Change dir... command in the File menu of Rgui.exe. I doesn't seems to happen if I do this immediately after starting R but well if I already did some computation. I don't have any problem by using directly setwd(). At 12:10 23/04/03, you wrote: >Date: Tue, 22 Apr 2003

(Sorry for the cross-post--- I wasn't sure which list is more appropriate...) Hi everyone, I've run into segfaults when using my randomForest package on large dataset (e.g., 100 x 15200) and large number of trees (e.g., ntree=7000 and mtry=3000). I'm wondering if anyone can give me some hints on where to look for the problem. The randomForest package mainly consists of two things:

(Sorry for the cross-post--- I wasn't sure which list is more appropriate...) Hi everyone, I've run into segfaults when using my randomForest package on large dataset (e.g., 100 x 15200) and large number of trees (e.g., ntree=7000 and mtry=3000). I'm wondering if anyone can give me some hints on where to look for the problem. The randomForest package mainly consists of two things:

Dear R-devel, I grabbed 1.7.0 beta from today. "make check" still fails at base-Ex.R. The last few lines of the output are: > lsf.str()#- how do the functions look like which I am using? Error in exists(nam <- nms[i], envir = envir, mode = mode) : F used instead of FALSE Execution halted Looks like the same problem as before, but at a different place. Mandrake Linux

Hi all, There is now a package available on CRAN that provides an R interface to Leo Breiman's random forest classifier. Basically, random forest does the following: 1. Select ntree, the number of trees to grow, and mtry, a number no larger than number of variables. 2. For i = 1 to ntree: 3. Draw a bootstrap sample from the data. Call those not in the bootstrap sample the

Hi all, There is now a package available on CRAN that provides an R interface to Leo Breiman's random forest classifier. Basically, random forest does the following: 1. Select ntree, the number of trees to grow, and mtry, a number no larger than number of variables. 2. For i = 1 to ntree: 3. Draw a bootstrap sample from the data. Call those not in the bootstrap sample the

Dear R-devel, Has anyone played with this? http://www.amd.com/us-en/Processors/DevelopWithAMD/0,,30_2252_2282,00.html <http://www.amd.com/us-en/Processors/DevelopWithAMD/0,,30_2252_2282,00.html> . I'll probably give it a shot... Best, Andy Andy Liaw, PhD Biometrics Research PO Box 2000, RY33-300 Merck Research Labs Rahway, NJ 07065 mailto:andy_liaw@merck.com

I know I should not mix base plotting functions with grid/lattice functions, but I have used a "quick-and-dirty" trick of par(new=T) in the past for annotating a trellis-drawn graph in various versions of S-PLUS. The sequence goes something like this: > windows(width = 5, height = 5, pointsize = 10) # open up the device > xyplot(y ~ x) > par(new=T) > xyplot(y2 ~ x) >

Dear R-help, This one is probably a piece of cake for regexp masters. I'd like to split a character vector (for simplicity, say of length one for now) that contains fields that are delimited by arbitrary number of white spaces (e.g., " a b c "). How do I get the character vector that contain the fields? In the example I gave, I've tried: > strsplit(" a b c

This is interesting: The crash does not happen if I run Rgui in MDI mode. The crash seemed to only occur in SDI. Andy =========================================================== For the record: Under Rgui, using the menu "File / Channge dir..." to change to a network drive crashes rgui. The crash happens if I browse to a folder on a mapped drive. I.e., if I type in

Dear R-help, I was bitten by the behavior of all() when given logical(0): It is TRUE! (And any(logical(0)) is FALSE.) Wouldn't it be better to return logical(0) in both cases? The problem surfaced because some un-named individual called randomForest(x, y, xtest, ytest,...), and gave y as a two-level factor, but ytest as just numeric vector. I thought I check for that in my code by testing

Dear R-help, Can some one explain why barplot() uses changing colors in the bars by default? I should think that most of the time when people draw barplots, they want the bars to be in the same color. (At least that's what I'd expect. The first time I used barplot() in R, I was shocked to see the colors.) As an example, one example in ?layout draws a scatterplot with histograms drawn

Dear R-help, Can some one explain why barplot() uses changing colors in the bars by default? I should think that most of the time when people draw barplots, they want the bars to be in the same color. (At least that's what I'd expect. The first time I used barplot() in R, I was shocked to see the colors.) As an example, one example in ?layout draws a scatterplot with histograms drawn

Hi All, While attempting to build R-patched using the Portland Group compiler suite on our dual Opteron 250 box running Scyld 29cz5 (based on RH, kernel 2.4.29), I get: make[5]: Leaving directory `/home/andy/Rbuild/R221-pgi/src/library/tools/src' make[5]: Entering directory `/home/andy/Rbuild/R221-pgi/src/library/tools/src' pgcc -I../../../../include -I/include -I/include/CC -fpic

Dear R-help, Has anyone experienced similar problem? On WinNT4(sp6), running Rgui from 1.7.0, when try to change directory to some network drive using the "File / Change dir..." menu, Rgui gets a visit by Dr. Watson. If I first change dir to a local drive, then again to a network drive, it works fine. It also works fine with setwd() from the command prompt. Best, Andy Andy I. Liaw,

Hi all, Thanks to Prof. Ripley, Prof. Gentleman, and Simon Wood (did I miss anyone?). The problem seemed to have gone away. Everyone suggested using some malloc debugger (such as Electric Fence). All I did was following half of what BDR suggested below, i.e., changing all the S_alloc() calls to Calloc() and Free(). I didn't get to try efence, and the problem seems to have disappeared! As

Under v1.6.2, Windows NT4 OS, when a function contains an execution error and I have placed browser() in inside the function body, the call to browser is ignored. A brief example to illustrate: > foo <- function(x) { + y <- x ^ 2 + browser() + foo2(x) ## Intentional error + x ^ 3 + } > > foo(30) Called from: foo(30) Browse[1]> Error in foo(30) : couldn't find

Dear R-devel, Inspired by Michael Li's talk at JSM, I decided to try rpvm and snow on our two linux boxes. It only took me a couple of hours of screwing around to get it working (sooner if I had RTFM). Our setup is: 2 dual PIII-866 Xeons, one with 2GB RDRAM, the other with 1.28GB RDRAM. The first machine is acting as the NIS/NFS server. both /usr and /home are exported to the second

Sorry for the cross-post: not sure whether it's Rterm or ESS (or something else?)... I'm running R (1.5.0 patched 2002-05-09, compiled from source on WinNT4) under ESS 5.1.21 with XEmacs 21.4.6. When I plotted a graph on the windows() device, and then use the menu in the R graphics window to print the graph, the printer selection dialog box does not show up until I go to the *R* buffer