Hello Rcpp'ers, I want to access a List of matrices in an Rcpp/C++ function that will passed to me via R...
src <- " using namespace Rcpp ; List inputList(L) ; NumericMatrix tmpMatrix ; tmpMatrix = NumericMatrix(inputList[0]) ; return(wrap(tmpMatrix.ncol())) ; " test <- cxxfunction(signature(L="list"), src, plugin = "Rcpp" ) This gives me the following error- file30b9664194fc.cpp: In function ‘SEXPREC* file30b9664194fc(SEXPREC*)’: file30b9664194fc.cpp:34: error: call of overloaded ‘Matrix(Rcpp::internal::generic_proxy<19>)’ is ambiguous /usr/share/R/include/Rcpp/vector/SubMatrix.h:57: note: candidates are: Rcpp::Matrix<RTYPE>::Matrix(const Rcpp::SubMatrix<RTYPE>&) [with int RTYPE = 14] /usr/share/R/include/Rcpp/vector/Matrix.h:67: note: Rcpp::Matrix<RTYPE>::Matrix(const Rcpp::Matrix<RTYPE>&) [with int RTYPE = 14] /usr/share/R/include/Rcpp/vector/Matrix.h:65: note: Rcpp::Matrix<RTYPE>::Matrix(const int&) [with int RTYPE = 14] /usr/share/R/include/Rcpp/vector/Matrix.h:46: note: Rcpp::Matrix<RTYPE>::Matrix(const Rcpp::Dimension&) [with int RTYPE = 14] /usr/share/R/include/Rcpp/vector/Matrix.h:39: note: Rcpp::Matrix<RTYPE>::Matrix(SEXPREC*) [with int RTYPE = 14] make: *** [file30b9664194fc.o] Error 1 In looking at the error, it's not clear to me how these candidates will help. What am I missing in telling Rcpp what class of object it should be expecting coming out of inputList? I know this kind of question (i.e. I want a 3d cube etc) pops up frequently and the answer is typically "use arma's 3d cubes" (e.g. http://stackoverflow.com/questions/8159872/r-list-of-numeric-vectors-c-2d-array-with-rcpp), but I don't intend on doing linear algebra. My data really is just a series of matrices of arbitrary sizes. Also, I looked into multi-dimensional arrays, but how to access them seems unclear; I did see a post on this list to that nature but the solution seemed inelegant. Thanks in advance for any help!
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