Define "sum" . Do you mean you want to get a single sum for each array? -- get marginal sums for each array? -- get a single array in which each value is the sum of all the individual values at the position?
Due thought and consideration for those trying to help by formulating your query carefully and concisely vastly increases the chance of getting a useful answer. See the posting guide -- this is a skill that needs to be learned and the guide is quite helpful. And I must acknowledge that it is a skill that I also have not yet mastered. Concerning your query, I would only note that the two responses from Greg and Petr that you received are unlikely to be significantly faster than just using loops, since both are still essentially looping at the interpreted level. Whether either give you what you want, I do not know. -- Bert On Mon, Apr 16, 2012 at 8:53 AM, Greg Snow <538...@gmail.com> wrote: > Look at the Reduce function. > > On Mon, Apr 16, 2012 at 8:28 AM, David A Vavra <dava...@verizon.net> wrote: >> I have a large number of 3d tables that I wish to sum >> Is there an efficient way to do this? Or perhaps a function I can call? >> >> I tried using do.call("sum",listoftables) but that returns a single value. >> >> So far, it seems only a loop will do the job. >> >> >> TIA, >> DAV >> >> ______________________________________________ >> R-help@r-project.org mailing list >> 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. > > > > -- > Gregory (Greg) L. Snow Ph.D. > 538...@gmail.com > > ______________________________________________ > R-help@r-project.org mailing list > 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. -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm ______________________________________________ R-help@r-project.org mailing list 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.