[Rd] lbfgsb from C/C++

[axionator]

Ok. Another question: I wanted to use RInternal and compile the following
small test example:

#include <RInside.h>

const char* hello( std::string who ) {
        std::string result( "hello ") ;
        result += who ;
        return result.c_str() ;
}

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

    RInside R(argc, argv);

    R["hello"] = Rcpp::InternalFunction( &hello );
    std::string result = R.parseEval("hello('world')") ;
    std::cout << "hello( 'world') =  " << result << std::endl ;

    return 0;
}

However, I get:

In file included from
/usr/local/lib/R/site-library/Rcpp/include/Rcpp/storage/storage.h:4:0,
                 from
/usr/local/lib/R/site-library/Rcpp/include/RcppCommon.h:128,
                 from /usr/local/lib/R/site-library/Rcpp/include/Rcpp.h:27,
                 from
/usr/local/lib/R/site-library/RInside/include/RInsideCommon.h:38,
                 from
/usr/local/lib/R/site-library/RInside/include/RInside.h:26,
                 from testRInside.cpp:1:
/usr/local/lib/R/site-library/Rcpp/include/Rcpp/storage/PreserveStorage.h:
In instantiation of ‘void Rcpp::PreserveStorage<CLASS>::set__(SEXP) [with
CLASS = Rcpp::InternalFunction_Impl<Rcpp::PreserveStorage>; SEXP =
SEXPREC*]’:
/usr/local/lib/R/site-library/Rcpp/include/Rcpp/InternalFunction.h:43:13:
required from ‘void Rcpp::InternalFunction_Impl<StoragePolicy>::set(SEXP)
[with StoragePolicy = Rcpp::PreserveStorage; SEXP = SEXPREC*]’
/usr/local/lib/R/site-library/Rcpp/include/Rcpp/generated/InternalFunction__ctors.h:37:3:
  required from
‘Rcpp::InternalFunction_Impl<StoragePolicy>::InternalFunction_Impl(OUT
(*)(U0)) [with OUT = const char*; U0 = std::basic_string<char>;
StoragePolicy = Rcpp::PreserveStorage]’
testRInside.cpp:16:49:   required from here
/usr/local/lib/R/site-library/Rcpp/include/Rcpp/storage/PreserveStorage.h:22:13:
error: ‘class Rcpp::InternalFunction_Impl<Rcpp::PreserveStorage>’ has no
member named ‘update’

Any ideas what's going wrong?


On Sun, Sep 7, 2014 at 4:46 PM, Dirk Eddelbuettel <edd at debian.org> wrote:

>
> On 7 September 2014 at 12:30, axionator wrote:
> | I would like to call R's lbfgsb function from my C/C++ code by including
> | R_ext/Applic.h and linking against libR.
> | Currently, I am allocating memory for x (and the other input arrays for
> | lbfgsb) in my C/C++ code via malloc/new. However, this gives a
> segmentation
> | fault when executing the program.
> | I tried to allocate x via PROTECT(x = NEW_NUMERIC(n)); x_p =
> | NUMERIC_POINTER(x);.
> | This compiles but also gives a segmentation fault.
> | Is there a way to use lbfgsb from C/C++ directly (without an intermediate
> | call of R)? Did I miss any compile flags?
>
> R is built to provide a 'language and environment', not a callable library.
>
> There is a however an optional callable library with a (much smaller)
> subset
> of functionality, see the section '6.16 Using these functions in your own C
> code' in the 'Writing R Extension' manual.  However, the library does /not/
> contain the bounded BFGS implementation you are seeking.
>
> So you may want to look at another (open source) optmization library. NLopt
> by Steven Johnson (http://ab-initio.mit.edu/wiki/index.php/NLopt) is
> decent
> and easy to use; if you need LBFGSB there is also Jorge Nocedal's site
> (http://www.ece.northwestern.edu/~nocedal/lbfgsb.html) as well as much
> more.
>
> Dirk
>
> --
> http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org
>

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