similar to: Calloc() & Free() in different .C(.) calls --> not usable ?

I'm working with the randomForest package and have successfully build a model. I'd like to go one step further however, and use the output from the model to construct a map using the output. My input data are spatial, and I have an independent set of rasterize maps for each of the predictor variables, to map the classification solution. Using the getTree function: >

Hello, I have a question concerning decision trees coming from RWeka : library(RWeka) m =J48(Species~.,data=iris) How could such a decision tree be transferred into a matrix, pretty much in the same fashion, as it is done by getTree() in library(ofw) library(ofw) data(srbct) attach(srbct) ##ofwCART learn.cart.keep <- ofw(srbct,

Hi All, In the script below, the importance measure for column 4 (ie MeanDecreaseGini) indicated "Inf" for V7. Running the getTree command showed that "V7" had been selected at least twice in one of the trees for Random Forest. So the "Inf" command was not generated as a result of dividing the sum of the decreases by 0. Any suggestions on what may be causing the

What does a status value of -3 mean when I do a regression with RF and use the getTree function? left daughter right daughter split var split point status prediction 1 2 3 11 4.721000e+03 -3 15.8489576 2 4 5 5 6.500000e+00 -3 11.3240895 3 6 7 10 6.790674e+02 -3 23.7250079 4

Version: platform = sparc-sun-solaris2.6 arch = sparc os = solaris2.6 system = sparc, solaris2.6 status = status.rev = 0 major = 0 minor = 64.2 year = 1999 month = July day = 3 language = R -- It is unclear to me that the handling of NAs is desirable, and it has problems with names: > z <- c(T,T,NA,F,T) > names(z) <- letters[1:5] > which(z) Error: names attribute

>>>>> "BDR" == Prof Brian Ripley <ripley at stats.ox.ac.uk> >>>>> on Tue, 13 May 2008 07:32:43 +0100 (BST) writes: BDR> This example does not crash in R 2.7.0, R-patched nor BDR> R-devel (r45677) for me (x86_64 F8 Linux.) It also BDR> does not crash with the CRAN build of R 2.7.0 on BDR> Windows XP. Neither does it

Estimados, tengo que hacer un calculo muy simple, pero con una BD mas o menos grande (250mil filas x 500 columnas) ... esta BD esta en formato de SPSS y la importo asi: library(foreign) bdr <- read.spss("CASEN_2013_MN_B_Principal.sav", use.value.labels=FALSE, to.data.frame=TRUE) luego, quiero transformar el DF en un data.tale pues el calculo requiere obtener promedios de

The problem with POSIXt is that you must consider timezones and daylight vs. standard time issues even if you don't want to. This violates modularity (viz. your routines becomes coupled to unrelated information) and leads to subtle errors where different routines are assuming different time zones. The problem is that the time, date, day of the week, month, etc. of a date depend on its

All, What purpose does the getTree function have in Random Forest? Can you graph it as you can in rpart and can it be interpreted in the same way? Helen Mills Poulos Yale School of Forestry

Dear all, I am working with randomForest package and I am interested in examining the "Gini importance" measures that are used as a general indicator of feature relevance. Is there a possibility of getting the Gini measure that is being estimated in each tree by the output of the getTree() function? Thanks a lot, Chrysanthi [[alternative HTML version deleted]]

Feature Requests item #6826, was opened at 2006-11-22 19:06 You can respond by visiting: http://rubyforge.org/tracker/?func=detail&atid=221&aid=6826&group_id=35 Category: None Group: None Status: Open Priority: 3 Submitted By: Nobody (None) Assigned to: Nobody (None) Summary: Add a traverse method to Wx::TreeCtrl Initial Comment: There is no simple way at the moment to iterate all

Indeed, there is no file named "dlltool" anywhere around here! So, at last I am beginning to suspect that my collection of tools is incomplete. What I have got is "rw1020sp.zip" and "http://www.stats.ox.ac.uk/pub/bdr/RWin/tools.zip". These are properly istalled, I think. readme.packages says "If your package has no C nor Fortran nor C++ sources, see `Simple

Hello, happy new year to all. The new Year gave me a new computer with Win98 and promptly I installed R on it. I created a directory R, with subdirectories gcc, perl,bin, helpwrk and rw1040. I got rw1040 from BDR place, the rest were gotter from the internet in the last week of the year, i.e. they are the newest versions. I modified autoexec.bat to put gcc\bin, perl\bin, etc in the path. I put the

CRAN has a package of mine in upload limbo because it failed UBSAN. I am not entirely ignorant on the topic of sanitizers and SAN / ASAN / UBSAN; we created not one but two Docker containers with ASAN and USBAN: https://registry.hub.docker.com/u/rocker/r-devel-san/ https://registry.hub.docker.com/u/rocker/r-devel-ubsan-clang/ as well as predecessors to them in earlier Docker repos. Yet I

R (Windows version) users/developers: While I have checked R-help/-devel mailing lists and R-bug-tracking system, this problem has not been reported so far. I would like to know whether this problem is specific to my machine. Lately I downloaded the version 1.5.0 patched [for windows] from http://www.stats.ox.ac.uk/pub/bdr/RWin/Rpre/ [patched: 2002-06-05] and

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

Dear all, bigKRLS, which has been on CRAN for a couple of years, had to be pulled recently due to what seems to be a sanitizer issue stemming from its use of bigmemory. bigKRLS works fine (we?ve used it ourselves on many different platforms and have had over 15,000 downloads without an end user reporting difficulties because of this issue). Unfortunately, we have been unable to reproduce the

One of my packages is slated to be archived from CRAN due to failures when the ATLAS BLAS is used. I am unable to replicate the error on my machine under R 3.6.1 using the atlas library from ubuntu (seems to be 3.10.2-9, while the good professor is using 3.10.3 per https://www.stats.ox.ac.uk/pub/bdr/Rblas/README.txt ). I also tried the rocker/r-base with R 3.6.2 and

Full_Name: Venkatesh Mysore Version: R-1.7.0 OS: WindowsXP Submission from: (NULL) (216.165.110.10) While accessing Rproxy.dll repeatedly (using the code from the (D)COM example in the R website) causes a failure in the 24th iteration. R-1.6.2 does NOT give this error. This seems to be a memory management error, that might be linked to the huge leakage difference between R-1.7.0 and R-1.6.2

(CC'ed to R-bugs ``for the record'') >>>>> "BDR" == Prof Brian D Ripley <ripley@stats.ox.ac.uk> writes: BDR> On Thu, 13 Jun 2002, Martin Maechler wrote: >> >>>>> "MM" == Martin Maechler >> <maechler@stat.math.ethz.ch> writes: >> >> >>>>> "BDR" ==