I want to run R script from C++ code.

Question

1.00/5 (2 votes)

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R does not get compiled into intermediate code. Can any one help on how to integrate R with C++.

What I have tried:

Tried running sample code to call a method from R script. Failed with linker errors.

Posted 18-Jun-17 20:58pm

AshwiniKJ

Updated 20-Jun-17 19:30pm

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Comments

Mohibur Rashid 19-Jun-17 3:05am

have you tried google?
http://gallery.rcpp.org/articles/r-function-from-c++/

AshwiniKJ 19-Jun-17 7:39am

I have a separate R script that is reading CSV and performing the task. Now I need to call that script/method from that script directly from my C++ code.

This is how I tried,

#include "stdafx.h"
#include <stdio.h>
#include <string.h>
#include "Rinternals.h"
#include "Rembedded.h"

SEXP hello() {
return mkString("Hello, world!\n");
}

int main(int argc, char **argv) {
SEXP x;
Rf_initEmbeddedR(argc, argv);
x = hello();
return 0; //x == NULL; /* i.e. 0 on success */
}

Geting following linker error:

error LNK2019: unresolved external symbol _Rf_initEmbeddedR referenced in function _main

Richard MacCutchan 19-Jun-17 7:42am

You need to add the R library that provides this function into your linker options, in the project parameters.

AshwiniKJ 19-Jun-17 7:48am

Hi Richard,

I guess the R library does not get built while installing R in windows. Can you please guide me on how to build this library. I saw R.dll in C:\Program Files\R\R-3.3.2\bin\i386 folder. But could not find the corresponding library. I am using R on windows 2008 OS and Visual Studio for C++ compilaton.

Richard MacCutchan 19-Jun-17 10:20am

R.dll is the library. I guess you need to go and study the documentation to find out what needs to be done to link to it.

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AshwiniKJ · Answer 1 · 2017-06-20T19:30:00

We can call a R script from C++ code as below,

#include "stdafx.h"
#include <iostream>
using namespace std;

int main(int argc, char **argv) {
cout<<"Before"<<endl;
system("C:\\\"Program Files\"\\R\\R-3.3.2\\bin\\rscript C:\\R-Scripts\\test_script.R");

return 0;
}

rscript is the command that executes the test_script.R.