On Tue, Jul 17, 2012 at 12:50 AM, Christian Gunning <icos.atr...@gmail.com> wrote: > On Mon, Jul 16, 2012 at 10:30 PM, > <rcpp-devel-requ...@lists.r-forge.r-project.org> wrote: >> 2. I have found in the past that some of the speeds gains from >> RcppArmadillo in comparison to pure R are lost when passing large matrices >> as arguments. There will always be overhead when passing arguments >> (especially large matrix arguments) to pretty much any function. Are there >> any tricks to minimize the overhead when passing a non-sparse matrix >> argument of say 1,000,000 by 500 from R to Armadillo?
Yes, at the expense of R's "inherently safe" pass-by-value semantics. Armadillo allows pass-by-reference semantics with advanced constructors. Just be aware of the risks... http://arma.sourceforge.net/docs.html#Mat -- you'll want copy_aux_mem = false. There's a good thread on this here: http://thread.gmane.org/gmane.comp.lang.r.rcpp/2717/focus=2722 -Christian <sent to list via wrong email address> -- A man, a plan, a cat, a ham, a yak, a yam, a hat, a canal – Panama! _______________________________________________ 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
