On 8 April 2011 at 00:27, deqiang sun wrote: | Hi all, | | Suppose I want to read a csv file including TEXT and NUMBER fields in R by function read.table. | Is there a way to use the result in C++? Like the way I use in R, say, 2nd column is x[,2], 3rd row is x[3,]. | I have gone through the examples in RInside and did not find anything helpful.
You will want to look at _Rcpp_ not RInside for these things. It is also a good idea to check the mailing list archive. Here I quickly search Google for "gmane rcpp-devel Rcpp::DataFrame" and found e.g. http://article.gmane.org/gmane.comp.lang.r.rcpp/1205 -- returning a data.frame from R to C++ and a bunch more. But I think you can't pass an entire dataframe from R to C++ _as a single object_ but it is easy to pass each column. Have a look at the documentation and the mailing list archives. Dirk | PS: Usually when I read a csv into C++ I would do splitting myself line by line and if I want to do operations between columns I need to write addition data structures. | | Thanks, | Dsun | | | | _______________________________________________ | 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 -- Dirk Eddelbuettel | e...@debian.org | http://dirk.eddelbuettel.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
