On Wed, Feb 16, 2011 at 11:47 AM, <ken.willi...@thomsonreuters.com> wrote: > Hi, I'm having some trouble wrapping a relatively simple C function using > Rcpp and inline and friends. This is my first time trying to use these > tools, so I'm sure I'm doing something wrong my immediate problem is > that I can't seem to figure out how to link against a library when > prototyping with cxxfunction(). My problem is explained here: > > http://stackoverflow.com/questions/5009026/extract-long-from-r-object
The dgCMatrix object is of an S4 class. It's best to use the S4 class from Rcpp so you can extract the slots as Rcpp::IntegerVector and Rcpp::NumericVector objects. Once you get them in that form the pointers are best obtained through the begin() method. The lme4a package in the lme4 project on R-forge uses these kinds of techniques in the MatrixNs::chmSp class. That class extends the cholmod_sparse struct that is defined in the CHOLMOD sources. You could similarly extend the smat struct as a class (smat is actually simpler than cholmod_sparse) and create a constructor like the chmSp constructor that takes the S4 SEXP. I can block out some code for you if you wish. > Anyone have any advice? I'm on OS X Snow Leopard. > > As an aside, have you considered moving this list to some open forum > that's 1) searchable and 2) wouldn't require specific registration before > posting? StackOverflow would get my vote, since it focuses not just on > answering questions but creating resources for those who come along > afterwards. > > Thanks. > > > [note, this is my second attempt sending this message, I think my first > one was denied since I wasn't subscribed to the list (though I didn't get > a notice to that effect). Now I am.] > > > -- > Ken Williams > Senior Research Scientist > Thomson Reuters > Phone: 651-848-7712 > ken.willi...@thomsonreuters.com > http://labs.thomsonreuters.com > > _______________________________________________ > 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 > _______________________________________________ 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
