similar to: Modifying R_CheckStack for a speed increase

? data=read.table("http://statcourse.com/research/boston.csv", , sep=",", header = TRUE) ? library(rpart) ? fit=rpart (MV~ CRIM+ZN+INDUS+CHAS+NOX+RM+AGE+DIS+RAD+TAX+ PT+B+LSTAT) Please: Show me the tree. Mark -------- Original Message -------- Subject: Re: [R] help with rpart From: "Stephen Milborrow" <[1]milbo at sonic.net>

Hi, As the subject suggests, I am looking for the most robust way to call an (arbitrary) function from the R API from another but the main POSIX thread in a package's code. I know that, "[c]alling any of the R API from threaded code is ?for experts only? and strongly discouraged. Many functions in the R API modify internal R data structures and might corrupt these data structures if

In R, 0 ^ NaN yields Inf. I would have expected NaN or perhaps 0. Is this behaviour intended? >sessionInfo() R version 2.8.0 (2008-10-20) i386-pc-mingw32 locale: LC_COLLATE=English_United States.1252;LC_CTYPE=English_United States.1252;LC_MONETARY=English_United States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252 attached base packages: [1] stats graphics grDevices utils

Stepan, Andreas gave a lot more thought into what you question in your reply. His question was how you can avoid what you where proposing and have proper threading under safe conditions. Having dealt with this before, I think Andreas' write up is pretty much the most complete analysis I have seen. I'd wait for Luke to chime in as the ultimate authority if he gets to it. The

Full_Name: Stephen Milborrow Version: R 2.8.0 OS: Windows XP Submission from: (NULL) (81.159.65.46) Under certain conditions, R 2.8.0 incorrectly echoes integer literals without the "L" suffix. R 2.7.2 is ok. To reproduce, create two files as follows: a.R containing: source("b.R", echo=TRUE) b.R containing: x <- 1L Now execute: Rterm --vanilla --silent <a.R This

Stephen, thanks for your effort. The more appropriate list for this discussion is probably R-devel (as far as I understand it) so I've moved the discussion there. Related topics have already been discussed in the past. Specifically, I remember contributions by Paul Johnson ("rockchalk" package) and John Fox ("effects" and "car" package) as their packages

Dear r-devel members, I encountered a C stack limit issue, when I tried to embed R 2.5 into my application. In the R-exts document, it says:"Note that R's own front ends use a stack size of 10Mb". I desire to know: is it possible to decrease this stack size by modifying R's source code? If it's possible, which part of the source code is responsible for the issue? Thank

Your analysis looks pretty complete to me and your solutions seems plausible. That said, I don't know that I would have the level of confidence yet that we haven't missed an important point that I would want before going down this route. Losing stack checking is risky; it might be eventually possible to provide some support for this to be handled via a thread-local variable. Ensuring

Hi Andreas, note that with the introduction of ALTREP, as far as I understand, calls as "simple" as DATAPTR can execute arbitrary code (R or native). Even without ALTREP, if you execute user-provided R code via Rf_eval and such on some custom thread, you may end up executing native code of some package, which may assume it is executed only from the R main thread. Could you (1)

Hi, I have tried to disable stack checking by set R_CStackLimit to -1. However, it always crashes my win32 multiple threads program. I am using R-2.5.0. My code looks like: #include <Rversion.h> #if (R_VERSION >= R_Version(2,3,0)) #define R_INTERFACE_PTRS 1 #define CSTACK_DEFNS 1 #include <Rinterface.h> #endif and then, add below line to my main function: R_CStackLimit =

Apparently the way to deal with this error message is to set R_CStackLimit = (uintptr_t)-1 I tried typing this in the R console, but it says Error: object "R_CStackLimit" not found. So where do I type it? In one of the initialization files that R uses when it starts up? I can't find the answer anywhere. Please note that I don't understand words like "DLL" or

> Looking for a simple, effective a minimum execution time solution. > > For a vector as: > > c(0,0,1,0,1,1,1,0,0,1,1,0,1,0,1,1,1,1,1,1) > To transform it to the following vector without using any loops: > (0,0,1,0,1,2,3,0,0,1,2,0,1,0,1,2,3,4,5,6) > Appreciate any suggetions. [[alternative HTML version deleted]]

Viewing certain postscript files under R 2.13-0 is very slow, at least using GSview on my 64 bit Windows 7 system. To see this, compare how long it takes to display these two files (fast.ps was created by removing the /srgb stuff in .ps.prolog): www.milbo.org/postscript/slow.ps www.milbo.org/postscript/fast.ps The code to produce the above two files is here:

Hi all, I'm developing an application on Mac OS X Darwin which embeds R. However, the application always crashes due to the C stack checking. I know that R_CStackLimit can be set to -1 to disable the stack checking, but I don't know where to put the code "R_CStackLimit=-1". Please give some instructions. Thank you very much! Here is my compiler infomation: $g++ -v Using

Hello all useRs, I am tring make a simple surface plot ( 2 by 2 terms of a MARS model (with earth package) but I get the follow error message: > plotmo( mars ) Error: bad index (missing column in x?) I don't no how to workround this... :-( I thanks in advanced by some help! Thanks. Cleber ############### > > ### example code: > library( earth ) > data( gasoline,

It appears to be legitimate to include multi-level categorical and continuous variables in defining the model for earth (e.g. y ~ cat + cont1 + cont2) but is it also then possible use categoricals in the predict method using the earth result? I tried but it returns an error which is not very informative. Thanks Chris

>>>>> Simon Urbanek <simon.urbanek at r-project.org> >>>>> on Mon, 1 Feb 2016 08:36:56 -0500 writes: > On Feb 1, 2016, at 4:16 AM, Martin Maechler <maechler at stat.math.ethz.ch> wrote: [..............] >> Back to R: I'm not familiar with that part of the code, neither >> the configuration, nor the usage (in

So I'm working on a custom front end to R, in one mode of the front end I dynamically load libR.so into a child worker thread. I'm very careful to make sure it is loaded by a single thread and loaded only once, but since it is a child thread it violates assumptions made by the stack size checking inside of R and I get innumerable errors along the lines of Error: C stack usage

Greetings R developers! I have been working on a just-in-time compiler for R arithmetic expressions. An example: jit(1) # turn on just-in-time compilation for(i in 1:na) # example convolution code for(j in 1:nb) ab[i + j] <- ab[i + j] + a[i] * b[j] The loop will run about 30% faster. That's not much of a speedup, but the code

On 25/10/2008 10:45 AM, milbo at sonic.net wrote: > Full_Name: Stephen Milborrow > Version: R 2.8.0 > OS: Windows XP > Submission from: (NULL) (81.159.65.46) > > > Under certain conditions, R 2.8.0 incorrectly echoes integer literals without > the "L" suffix. R 2.7.2 is ok. > > To reproduce, create two files as follows: > a.R containing: