On 6 March 2011 at 12:37, Paul Smith wrote:
| Dear All,
|
| I would like to use
|
| - plot,
| - curve
|
| inside a C++ program. What R package do you recommend? Rcpp?
You can use base R, embedding R is explained in the 'Writing R Extensions'
manual. That said, the material is a little on the advanced side.
Rcpp and RInside try to provide an easier API, and some users find it
helpful.
As for your question, I am committing the code below as rinside_sample11.cpp
in the examples/standard/ directory of RInside. With the generic Makefile in
that diretory, you just say 'make' and the rinside_sample11 binary results
(as do all the other examples and tests there).
I hope you find it mostly self-explanatory, if not please come to the
rcpp-devel list for help.
Dirk
// Simple example motivated by post from Paul Smith <phh...@gmail.com>
// to r-help on 06 Mar 2011
//
// Copyright (C) 2011 Dirk Eddelbuettel and Romain Francois
#include <RInside.h> // for the embedded R via RInside
int main(int argc, char *argv[]) {
// create an embedded R instance
RInside R(argc, argv);
// evaluate an R expression with curve()
// because RInside defaults to interactive=false we use a file
std::string cmd = "tmpf <- tempfile('curve'); "
"png(tmpf); "
"curve(x^2, -10, 10, 200); "
"dev.off();"
"tmpf";
// by running parseEval, we get the last assignment back, here the filename
std::string tmpfile = R.parseEval(cmd);
std::cout << "Could now use plot in " << tmpfile << std::endl;
unlink(tmpfile.c_str()); // cleaning up
// alternatively, by forcing a display we can plot to screen
cmd = "x11(); curve(x^2, -10, 10, 200); Sys.sleep(30);";
// parseEvalQ evluates without assignment
R.parseEvalQ(cmd);
exit(0);
}
--
Dirk Eddelbuettel | e...@debian.org | http://dirk.eddelbuettel.com
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