The question was about matrices, not data frames or data tables. While faster than Reduce, the conversions still make it over twice as slow as Rui's answer.
On June 10, 2018 12:18:39 PM HST, Benjamin Christoffersen <boenn...@gmail.com> wrote: >You may be able to speed it up further by using `data.table`'s >`rbindlist` or a similar function as shown here >https://stackoverflow.com/a/49772719/5861244. > >2018-06-10 21:20 GMT+02:00 Christofer Bogaso ><bogaso.christo...@gmail.com>: >> Using do.call() reduces my calculation time significantly. >> >> On Sun, Jun 10, 2018 at 10:45 PM ruipbarradas <ruipbarra...@sapo.pt> >wrote: >> >>> Hello, >>> >>> Instead of Reduce try do.call. >>> >>> do.call ('rbind', list) >>> >>> But with such a long list it will still take time. >>> >>> Hope this helps, >>> >>> Rui Barradas >>> >>> >>> >>> Enviado a partir do meu smartphone Samsung Galaxy. >>> -------- Mensagem original -------- >>> De: Christofer Bogaso <bogaso.christo...@gmail.com> >>> Data: 10/06/2018 16:33 (GMT+00:00) >>> Para: r-help <r-help@r-project.org> >>> Assunto: [R] Efficient manipulation with list object >>> >>> Hi, >>> >>> I have a list of length 10,000, and each element of that list is a >matrix >>> with 3 columns and 2,000 rows. >>> >>> Now when I tried to make a Matrix object with that list using >>> Reduce('rbind', list), my code is taking a considerable amount of >time. >>> >>> Is there any way to implement same above task in more efficient way? >>> >>> Thanks, >>> >>> [[alternative HTML version deleted]] >>> >>> ______________________________________________ >>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >>> https://stat.ethz.ch/mailman/listinfo/r-help >>> PLEASE do read the posting guide >>> http://www.R-project.org/posting-guide.html >>> and provide commented, minimal, self-contained, reproducible code. >>> >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide >http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. > >______________________________________________ >R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >https://stat.ethz.ch/mailman/listinfo/r-help >PLEASE do read the posting guide >http://www.R-project.org/posting-guide.html >and provide commented, minimal, self-contained, reproducible code. -- Sent from my phone. Please excuse my brevity. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
