inst/examples/standard/rinside_sample8.cpp

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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4;  tab-width: 8; -*-
//
// Simple example showing how to use R[] = ; 
//
// Copyright (C) 2010 Dirk Eddelbuettel and Romain Francois

#include <RInside.h>                    // for the embedded R via RInside

int main(int argc, char *argv[]) {

    RInside R(argc, argv);              // create an embedded R instance 
    
    R["x"] = 10 ;                       // assignment can be done directly via []
    R["y"] = 20 ;

    R.parseEvalQ("z <- x + y") ;        // R statement evaluation and result 
    int sum = R["z"];                   // retrieval via access using [] and implicit wrapper
    std::cout << "10 + 20 = " << sum << std::endl ; 

    // we can also return the value directly
    sum = R.parseEval("x + y") ;
    std::cout << "10 + 20 = " << sum << std::endl ; 

    exit(0);
}