Integrate Fortran, C++ with R -

my task rewrite r function in c++ accelerate while loops. r codes has been rewritten in of rcpp , armadillo except .fortran() . try use rinside @ first , works @ slow speed dirk indicated .(it expensive data go through r-> c++ ->r ->fortran)

since dont want rewrite fortran codes in c++ , vice versa, looks natural accelerate programs linking c++ directly fortran: r-> c++ -> fortran.

// [[rcpp::depends(rcpparmadillo)]]  #include <rcpparmadillo.h> using namespace rcpp;  extern "c"{    list f_(int *n,numericmatrix a, numericvector c, double* eps); } 

the problem can integrate c++ fortran, , integrate r c++, cant make these 3 things work together!

i try compile c++ in linux can't find rcpparmadillo.h , namespace rcpp

 error: rcpparmadillo.h: no such file or directory  error: 'rcpp' not namespace-name 

when call sourcecpp("test.cpp") in r directly, console display:

test.o:test.cpp:(.text+0x20b2): undefined reference `f_' collect2: ld returned 1 exit status error in sourcecpp("test.cpp") : error occurred building shared library. 

i try combine these things in package rcpparmadillo::rcpparmadillo.package.skeleton("tttest")

but don't know how deal package tttest(i believe not installed) after add .cpp , .f files /src , run compileattributes.

so, possible things imagine rcpp? or necessary convert fortran codes c/c++ codes...