On 3 August 2017 at 11:30, George Coles wrote: | Hi, | I have recently been writing a lot of c++. I have been a big python user | the last couple of years, and never really use R but have it installed.
Coming from a common base is not a bad starting point at all. See my RcppAnnoy package on top of the C++ (with Python glue) Annoy package, and also see https://cran.r-project.org/package=fastcluster which "comes with" Python and R bindings. | I need to share some data between my Python code and my c++ code, C++ does | not really have a lot of nice ideas like DataFrames. But if you save a | dataframe from Python into csv, you can readily read it using R. Csv is not | the best way to go, but it is a simple case. CSVs are indeed a terrible format, yet annoyingly common. Try binary alternatives if you can. There are feather and Apache arrow for 'data.frame' reimplementations usable from both R and Python... Lastly, there is now reticulate (on CRAN) to access Python from R. | I have generally been noticing as I google around, that R has a healthy and | seemingly growing list of packages that can be accessed by c++ code. From | c++, R does not look so bad to me, and I would like to get access to this | large library of native routines in R. | | First on the list, is that I hope to read a dataframe or something like it | from data in a file, and then transform that dataframe or other tabular | object into something I can use in my c++ code for linear algebra, like an | Armadillo matrix. | | So is there any native code in the R world that I can use to read a | dataframe from a file? | | please forgive my ignorance. I think Rcpp is really cool, it might make me | a backdoor R user. Poke around the examples, and eg the Rcpp Gallery (at gallery.rcpp.org). The seamless passage from R to C++ and back is really, really useful and smooth. JJ and I have riffing for years on the need for a talk on 'R as C++ shell'. No time for that yet though :) Cheers, 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
