c++ - error when passing `arma::cube`argument to function using RcppArmadillo -

i getting following error when trying compile using sourcecpp rcpppackage:

`my path r/.../rcpp/internal/exporter.h` no matching function call 'arma::cube<double>::cube(sexprec*&)' 

the object cube armadillo equivalent of array in r.

edit: note problem seems function can't accept arma::cube object argument. if change arma::cube bby arma::mat bit work:

#include <rcpparmadillo.h> // [[rcpp::depends(rcpparmadillo)]]  using namespace arma;  //  [[rcpp::export]] arma::cube ssmooth(arma::mat  a,                     arma::cube b) {  int ns = a.n_rows;     int nk = a.n_cols;     int np = b.n_rows;      arma::mat c = zeros<mat>(nk, ns); arma::cube d = zeros<cube>(nk, nk, ns);  return d;  } 

i appreciate hint.

a basic example works:

r> cppfunction("arma::cube getcube(int n) { arma::cube a(n,n,n);\                     a.zeros(); return a; }", depends="rcpparmadillo") r> getcube(2) , , 1       [,1] [,2] [1,]    0    0 [2,]    0    0  , , 2       [,1] [,2] [1,]    0    0 [2,]    0    0  r>  

so either doing wrong or installation off.