Using C++ in R compling error: "RcppArmadillo.h: No such file or directory"

armadillo, c++, r, rcpp

Solution

You cannot just `R CMD SHLIB` this file. Because you use Rcpp attributes, you need some code to be generated from `Rcpp::depends` and `Rcpp::export`.

You can either call `sourceCpp( 'my.cpp' )` from R if you just want standalone use of the file or use various tools such as `compileAttributes` or `devtools::load_all` if this file is part of a package you are developping.

But `R CMD SHLIB` is not going to generate the extra code for you.

Something I have on my `$PATH` and find quite useful is this `RcppScript` script:

#!/usr/bin/Rscript

args <- commandArgs(TRUE)

if( "-v" %in% args ){
  options( verbose = TRUE )
}

library(Rcpp)
sourceCpp( tail(args,1) )

So that you can do:

$ RcppScript my.cpp

Problem

``` $ export PKG_CPPFLAGS=`Rscript -e 'Rcpp:::CxxFlags()'` $ export PKG_LIBS=`Rscript -e 'Rcpp:::LdFlags()'` $ R CMD SHLIB my.cpp g++ -I/usr/share/R/include -DNDEBUG -I/usr/local/lib/R/site-library/Rcpp/include -fpic -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -D_FORTIFY_SOURCE=2 -g -c my.cpp -o my.o my.cpp:3:27: fatal error: RcppArmadillo.h: No such file or directory compilation terminated. make: *** [my.o] Error 1 ``` My `RcppArmadillo.h` is under ``` $ locate -i RcppArmadillo.h /usr/local/lib/R/site-library/RcppArmadillo/include/RcppArmadillo.h ``` I wonder how to specify its path to the compiler? `my.cpp` looks like: ``` #include <RcppArmadillo.h> #include <math.h> // [[Rcpp::depends(RcppArmadillo)]] using namespace Rcpp; using namespace arma; // [[Rcpp::export]] ... ``` My OS is Ubuntu 12.04. R is R version 3.1.0 (2014-04-10). I just installed `Rcpp` and `RcppArmadillo`, so I guess they are also the most recent ones. Thanks and regards!

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