Rcpp error: /usr/bin/ld cannot find -lgfortran

Question

I am working through the book \"Seamless R and C++ Integration with Rcpp\". I am using R version 3.1.0 on Ubuntu 12.04. I cannot figure out how to properly link the necess

Answer 1

Can you run the following command, please:

edd@max:~$ dpkg -l | grep libgfortran | cut -c-75
ii  libgfortran-4.7-dev:amd64                     4.7.3-7ubuntu3           
ii  libgfortran-4.8-dev:amd64                     4.8.1-10ubuntu9          
ii  libgfortran3:amd64                            4.8.1-10ubuntu9          
edd@max:~$ 

You need the libgfortrain-$VERSION-dev package for your machine. At some point having gfortran implied this via r-base-dev and its dependence on build-essentials.

Edit: Version numbers will of course be different on your 12.04 release; this was from a machine running 13.10.

Edit 2, based on your update: Your use of sourceCpp() is incorrect. You are not telling Rcpp that you need Armadillo, so Rcpp responds by saying it does not know Armadillo. You can either use a Rcpp::depends() in the cpp file, or use the plugin= argument.

So here is how I would write the code you have above. You can then just call sourceCpp() on the file which will create a function rcppSim() you can call:

#include <RcppArmadillo.h>

// [[Rcpp::depends(RcppArmadillo)]]

// [[Rcpp::export]]
arma::mat rcppSim(arma::mat coeff, arma::mat errors) {
   int m = errors.n_rows;
   int n = errors.n_cols;
   arma::mat simdata(m,n);
   simdata.row(0) = arma::zeros<arma::mat>(1, n);
   for (int row=1; row < m; row++) {
     simdata.row(row) = simdata.row(row-1)*trans(coeff) + errors.row(row);
   }
   return simdata;
}