Hi, Paul Saary For a data.frame, you should use as.matrix(data.frame) before use its in C/C++ function. That is my experiment.
> > On 19 May 2016 at 12:47, Paul Saary wrote: > | Thank you for your reply, > | > | > If you always use vector< vector< double > > then I would start with > | > Rcpp::NumericMatrix, or arma::mat. > | > | The problem is, that I want to offer the user a choice of using also > | data.frames and not just Matrices. So I can not really decide, with what > | I start, or am I wrong? > > Yes :) > > A data.frame is simply not a matrix. It allows different types. Which you > cannot represent here. > > | Regarding the use of Rcpp:function: > | As the R objects used are very large (many MB to some GB), I would like > | to do the transformation into a usable format, in my case into the > | vector< vector< double > >, in CPP, as I imagine it to be much faster. > > Imagination can be a dangerous thing. Most of us prefer profiling. > > | I will have look into armadillo, but I hoped to avoid loading another > | library, to reduce the depencies of my script/package. > > Please do look into it. It is worth it. And the added size, relative to > the > footprint you already have with R, is marginal. And there is none at > run-time -- C++ and all that. > > Dirk > > -- > http://dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org > _______________________________________________ > Rcpp-devel mailing list > Rcpp-devel@lists.r-forge.r-project.org > https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel > > -- Khanh To Duc PhD student, Department of Statistical Science, XXIX cycle. Office: Room 130 Telephone: +39 049 827 4147 Mobile: +39 345 667 0711 http://www.stat.unipd.it/it/fare-ricerca/duc-khanh _______________________________________________ Rcpp-devel mailing list Rcpp-devel@lists.r-forge.r-project.org https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
