Thanks for the tips. Still, Range() is the correct way to write:
NumericVector my_vec(200); my_vec(Range(0,10)) = 10; ? Thanks in advance -- Francisco Bischoff, MD, MSc Faculty of Medicine of the University of Porto, Portugal - Master of Medical Informatics | topic: time series - Research Associate | artificial intelligence for health <https://mailtrack.io/trace/link/1765b288bbce44d233e851a8d862ec594378aa04?url=http%3A%2F%2Fcintesis.eu%2Fai4health%2F&userId=3785237&signature=1b62d7a180130981> @ cintesis.eu <https://mailtrack.io/trace/link/89b15c4212d5d6c8d4ba354ec92ab002ba9a96ef?url=http%3A%2F%2Fcintesis.eu&userId=3785237&signature=5fa97b31373fa664> - Teaching Assistant | department of community medicine, information and health decision sciences @ med.up.pt <https://mailtrack.io/trace/link/32f5f446b7bc0d597241524764b3636b5a75d466?url=http%3A%2F%2Fmed.up.pt&userId=3785237&signature=cfbca25f5fe210b3> ORCID: 0000-0002-5301-8672 | Mendeley: francisco-bischoff | Google: tCeA0uUAAAAJ | ResearcherID: H-8261-2016 | ResearchGate: Francisco_Bischoff | CiênciaID B413-E0A0-DE8D | LinkedIn: franzbischoff On Sat, Jan 16, 2021 at 1:54 AM Dirk Eddelbuettel <e...@debian.org> wrote: > > On 16 January 2021 at 01:35, Francisco Bischoff wrote: > | About the Range() function, I think it should handle decreasing ranges > | too... > | But, idk if using Matlabs approach or R approach: > | > | R's: > | > | a <- 1 > | b <- 10 > | > | print(a:b) > | 1 2 3 4 5 6 7 8 9 10 > | print(b:a) > | 10 9 8 7 6 5 4 3 2 1 > | > | Matlab's > | a = 1; > | b = 10; > | disp(a:b); > | 1 2 3 4 5 6 7 8 9 10 > | disp(b:a); > | numeric(0) > | disp(b:-1:a) > | 10 9 8 7 6 5 4 3 2 1 > | > | I think that we are in the R domain, so we should use Range(b, a) > normally > | (my humble opinion). > > Hm but I think the Range class in Rcpp is not the same as R's seq(). It is > used internally in a few places and may not generalize well to the 'b:-1:a' > use. > > I had a quick look, and Armadillo may not have anything directly relevant > either. linspace() is close but not quite the same. > > I would probably just write myself a little helper function. > > | About Casting, this is a good example: > | > | Rcout << Range(0, 10) << std::endl; > | > | This does not compute... > | > | What should I do? > | > | Rcout << as<IntegerVector>(Range(0, 10)) << std::endl; > | or > | Rcout << (IntegerVector)(Range(0, 10)) << std::endl; > > That can happen as template expressions can get in the way. Alternatives > are > maybe using Armadillo types for, again, just using a quick loop and > printing > elements. > > Rcpp has a lot of functions. But it doesn't have "all of R's functions" and > should not be seen as aiming for that. > > Dirk > > -- > https://dirk.eddelbuettel.com > <https://mailtrack.io/trace/link/ec16eaacf00108f6b925d8cd55d469ea736d3313?url=https%3A%2F%2Fdirk.eddelbuettel.com&userId=3785237&signature=5ff5161e5ff16475> > | @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
