similar to: pass a vector to C++

I have a question related to scoping. Suppose we have 2 functions: f1 = function(i){i = 1} f2 = function(n){ i = length(n) f1(i) } In other words, I would like i=1 regardless of n. Is this possible without having f1 in the body of f2? Thanks in advance!

Hello, I have a question about list indexing. Lets say we have a list of 3 lists, each containing 3 different type elements: > a=replicate(3, list(list(c(1,1,1), diag(3), c(2,2,2)))) > a [[1]] [[1]][[1]] [1] 1 1 1 [[1]][[2]] [,1] [,2] [,3] [1,] 1 0 0 [2,] 0 1 0 [3,] 0 0 1 [[1]][[3]] [1] 2 2 2 [[2]] [[2]][[1]] [1] 1 1 1 [[2]][[2]] [,1] [,2] [,3]

dear R experts---I am using the coef() function to pick off the coefficients from an lm() object. alas, I also need the standard errors and I need them fast. I know I can do a "summary()" on the object and pick them off this way, but this computes other stuff I do not need. Or, I can compute (X' X)^(-1) s^2 myself. Has someone written a fast se() function? incidentally, I think

Hi, I have been using R for close to two years now and have grown quite comfortable with the language. I am presently trying to implement an optimization routine in R (Newton Rhapson). I have some R functions that calculate the gradient and hessian (pre requisite matrices) fairly efficiently. Now, I have to call this function iteratively until some convergance criterion is reached. I think the

On 3 December 2017 at 05:23, Eric Berger <ericjberger at gmail.com> wrote: > > Do a search on "Rcpp calling C++ functions from R" > Thanks. However search for "Rcpp calling C++ functions from R" gives a lot of result but I think some of them are outdated and others don't agree with each other. Can you point to a specific good on-line guide for me? Regards

I would go to the source, in this case Dirk Eddelbuettel's (I hope I spelled it correctly) documentation for Rcpp: http://dirk.eddelbuettel.com/code/rcpp/Rcpp-attributes.pdf Note that you need to do sourceCpp("logistic_map.cpp") in R instead of building and dyn.load()-ing the object. HTH, Peter On Sun, Dec 3, 2017 at 11:04 AM, Martin M?ller Skarbiniks Pedersen <traxplayer

On 3 December 2017 at 20:19, Dirk Eddelbuettel <edd at debian.org> wrote: Hi Dirk, Thanks for your answers. I got a few more questions. > > 0) Wrong list. Rcpp has its down, rcpp-devel, and I basically do not read > this and would have missed this were it not for luck. OK. I did found the rcpp-devel mailing-list. But I though it was a developers of the rcpp-package. So it is ok

All, I'm a newbie to R and I am interested in seeing a simple example of calling a 3rd party Visual Studio generated DLL from RStudio. Does anyone have a simple example which also walks through the preliminary steps of setting up the INCLUDE path and the library path to either a DLL or LIB file ? I have tried to find an easy example, but thus far had no luck finding an example using Rcpp

Dear R users, I would like to call R from C++ and Rcpp class library already compiled are a big advantage !! I have already read the doc/PDF in the installed package 5.0 and all the posts in this forum It's possible to get the source code (RcppExample.cpp) whitout Rtools ?? (i'm not familiar whit Rtools) many thanks in advance Roberto Iacopetti win XP sp 2.2600 Dev-C++ 4.9.9.2 R

Hi, I have written a small C++ function and compile it. However in R I can't see the function I have defined in C++. I have read some web-pages about Rcpp and C++ but it is a bit confusion for me. Anyway, This is the C++-code: #include <Rcpp.h> using namespace Rcpp; // [[Rcpp::export]] List compute_values_cpp(int totalPoints = 1e5, double angle_increment = 0.01, int radius =

I have intstalled R-3.2.2,Rcpp-0.12.2,RInside-0.2.13 on windows. I compiled the example1 of RInside in the example directory which create a RInside instance and prints "hello world". The compiler is intel c++. I included the RInside source files in the project and fixed the compile and link errors. But when run the executable file it prints some error message and quites. I debug

Dear All, I would like to use - plot, - curve inside a C++ program. What R package do you recommend? Rcpp? Thanks in advance, Paul

Hello, I'm writing an R extension in C++. In the extension, I want to invoke an R function directly and it works when I use Rcpp in the serial code. But what I really want is to invoke the R function in parallel with openmp. When I do so, I got segmentation fault. I remember someone said that R isn't thread-safe. I think it's also understandable because an R function also has

Dear all, I am testing a simple C++ function that takes a double matrix as argument and which uses routines provided by the C++ Armadillo package. I am aware of the nice capabilities of Rcpp and RcppArmadillo which helps simplifying a lot and that I have already successfully tested. However, I had a hard time trying to figure out how the coercion from a REALSPX matrix to an arma::mat =

Hi, I'd like to construct an R list object in C++, fill it with relevant data, and pass it to an R function which will return a different list object back. I have browsed through all the R manuals, and examples under tests/Embedding, but can't figure out the correct way. Below is my code snippet: #include <Rinternals.h> // Rf_initEmbeddedR and other setups already performed

Hi, We are a company developing a software mainly in C++. We want to integrate R inside our software in order to use mainly the engine (usual stats as mean, sigma, Pearson, outlier detection, CPA, multivariate, ...) and probably later the chart solution. Of course we don''t want to temporary write the data to some csv files and then do an ugly system() call :

Hi, We are a company developing a software mainly in C++. We want to integrate R inside our software in order to use mainly the engine (usual stats as mean, sigma, Pearson, outlier detection, CPA, multivariate, ...) and probably later the chart solution. Of course we don''t want to temporary write the data to some csv files and then do an ugly system() call :

Martin, You are making your life way too complicated. There are a number of things I would do differently: 0) Wrong list. Rcpp has its down, rcpp-devel, and I basically do not read this and would have missed this were it not for luck. On 3 December 2017 at 02:06, Martin M?ller Skarbiniks Pedersen wrote: | I have read some web-pages about Rcpp and C++ but it is a bit confusion | for me. 1)

Hi all, is there a way to integrate R language within a c++ programme? That is, is there something like an R library I can incorporate in my c++ code? Thanks, Javier

On 2 March 2015 at 09:09, Duncan Murdoch wrote: | I generally recommend that people use Rcpp, which hides a lot of the | details. It will generate your .Call calls for you, and generate the | C++ code that receives them; you just need to think about the real | problem, not the interface. It has its own learning curve, but I think | it is easier than using the low-level code that you need to