Thanks Bert! On Fri, Jul 24, 2015 at 7:57 PM, Bert Gunter <bgunter.4...@gmail.com> wrote:
> Janh: > > It sounds like you really need to go through an R tutorial or two > before posting further, as this is a pretty basic query. Or am I wrong > about this? > > An answer: Just use indexing > > cumsum(1/seq_len(100)^2)[seq(10, to = 100,by = 10)] ## keeps every 10th > > [1] 1.549768 1.596163 1.612150 1.620244 1.625133 1.628406 1.630750 > 1.632512 1.633884 > [10] 1.634984 > > > But beware FAQ 7.31 for long series. > > Cheers, > Bert > > > Bert Gunter > > "Data is not information. Information is not knowledge. And knowledge > is certainly not wisdom." > -- Clifford Stoll > > > On Fri, Jul 24, 2015 at 4:37 PM, Janh Anni <annij...@gmail.com> wrote: > > Hello Jeff, > > > > Thanks a lot. I tried it and see that it prints out the entire 100 > partial > > sums, so I can take the last value as the partial sum for the first 100 > > terms. Would there be any way cumsum can print only the nth partial sum, > > i.e. the last value in the array, instead of printing the entire array? > > Thanks again. > > > > Joseph > > > > On Fri, Jul 24, 2015 at 2:02 PM, Jeff Newmiller < > jdnew...@dcn.davis.ca.us> > > wrote: > > > >> Please reply-all so the mailing list stays in the loop. > >> > >> cumsum(1/(1:100)^2) > >> > >> gives you the partial sums up through i=100. > >> > --------------------------------------------------------------------------- > >> Jeff Newmiller The ..... ..... Go > Live... > >> DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live > >> Go... > >> Live: OO#.. Dead: OO#.. Playing > >> Research Engineer (Solar/Batteries O.O#. #.O#. with > >> /Software/Embedded Controllers) .OO#. .OO#. > rocks...1k > >> > --------------------------------------------------------------------------- > >> Sent from my phone. Please excuse my brevity. > >> > >> On July 24, 2015 10:30:09 AM PDT, Janh Anni <annij...@gmail.com> wrote: > >> >Hello Jeff, > >> > > >> >Thank you so much for the suggestion, I searched cumsum as suggested > >> >but > >> >not sure it is what I had in mind. For instance if I had the infinite > >> >series: [image: Inline image 1] > >> > > >> >and want to compute the sum of the, say, first 100 terms, how could I > >> >use > >> >cusum to do that? > >> > > >> >Thanks again, > >> > > >> >Janh > >> > > >> > > >> >On Thu, Jul 23, 2015 at 11:51 PM, Jeff Newmiller > >> ><jdnew...@dcn.davis.ca.us> > >> >wrote: > >> > > >> >> ?cumsum > >> >> > >> > >> > >--------------------------------------------------------------------------- > >> >> Jeff Newmiller The ..... ..... Go > >> >Live... > >> >> DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. > Live > >> >> Go... > >> >> Live: OO#.. Dead: OO#.. > >> >Playing > >> >> Research Engineer (Solar/Batteries O.O#. #.O#. with > >> >> /Software/Embedded Controllers) .OO#. .OO#. > >> >rocks...1k > >> >> > >> > >> > >--------------------------------------------------------------------------- > >> >> Sent from my phone. Please excuse my brevity. > >> >> > >> >> On July 23, 2015 8:23:39 PM PDT, Janh Anni <annij...@gmail.com> > >> >wrote: > >> >> >Dear All, > >> >> > > >> >> >Does anyone know of any R functions that compute partial sums of > >> >> >series? > >> >> > > >> >> >Thanks in advance! > >> >> > > >> >> >Janh > >> >> > > >> >> > [[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. > [[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.
