<html><body><div>I am curious what usage of data.frame give you the conclusion that it is slow. You must know that data.frame IS a list of variables, which can be vectors (though not always) and can only be faster than a list of lists.</div><div><br></div><div>Best,</div><div><br></div><div>Yan<br><br>On Jan 15, 2013, at 03:20 PM, John Merrill <john.merrill@gmail.com> wrote:<br><br></div><div><blockquote type="cite"><div class="msg-quote"><div dir="ltr">It appears that DataFrame::create is a thin layer on top of the R data.frame call. The guarantee correctness, but also means the performance of an Rcpp routine which returns a large data frame is limited by the performance of data.frame -- which is utterly horrible.<div><br></div><div style="style" data-mce-style="">In the current version of R, there's a trivial, but borderline evil, work around: build a list of lists meeting the basic requirements of a data frame (they all need to be of the same length, and each component list needs to be named) and set the type of the object to "data.frame". </div><div style="style" data-mce-style=""><br></div><div style="style" data-mce-style="">I have two questions:</div><div style="style" data-mce-style="">(1) Is it reasonable to anticipate that this hack will continue to work for the near future in R?</div><div style="style" data-mce-style="">(2) If so, would a patch to that effect be of interest to the developers? </div></div><div class="_stretch">_______________________________________________<br> Rcpp-devel mailing list<br> <a href="mailto:Rcpp-devel@lists.r-forge.r-project.org" data-mce-href="mailto:Rcpp-devel@lists.r-forge.r-project.org">Rcpp-devel@lists.r-forge.r-project.org</a><br> <a href="https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel" data-mce-href="https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel">https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel</a></div></div></blockquote></div></body></html>