I mean the first row value În Vin, 4 mar. 2016, 16:15 Jeff Newmiller, <jdnew...@dcn.davis.ca.us> a scris:
> "Keep the first values" is imprecise, but mixing an absolute value with a > bunch of differences doesn't usually work out well. I frequently choose > among > > x <- sample( 10 ) > dxright <- c( 0, diff(x) ) > dxleft <- c( diff(x), 0 ) > > for calculation purposes depending on my needs. > -- > Sent from my phone. Please excuse my brevity. > > On March 4, 2016 3:28:08 AM PST, Olivier Crouzet < > olivier.crou...@univ-nantes.fr> wrote: > >Hi, > > > >(1) You should provide a minimal working example; > > > >(2) But anyway, does... > > > >x = sample(10) > >c(x[1],diff(x)) > > > >... do what you want? > > > >Olivier. > > > > > >On Fri, 4 Mar 2016 > >13:22:07 +0200 catalin roibu <catalinro...@gmail.com> wrote: > > > >> Dear all! > >> > >> I want to calculate difference between successive values (cumulative > >> values) with R. I used diff function, but I want to keep the first > >> values. > >> > >> Please help me to solve this problem! > >> > >> Thank you! > >> > >> Best regards! > >> > >> CR > >> > >> -- > >> > >> - > >> - > >> Catalin-Constantin ROIBU > >> > >> Lecturer PhD, Forestry engineer > >> Forestry Faculty of Suceava > >> Str. Universitatii no. 13, Suceava, 720229, Romania > >> office phone +4 0230 52 29 78, ext. 531 > >> mobile phone +4 0745 53 18 01 > >> FAX: +4 0230 52 16 64 > >> silvic.usv.ro <http://www.usv.ro/> > >> > >> [[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. > > > >-- > > Olivier Crouzet, PhD > > Laboratoire de Linguistique de Nantes -- UMR6310 > > CNRS / Université de Nantes > > Chemin de la Censive du Tertre -- BP 81227 > > 44312 Nantes cedex 3 > > France > > > > http://www.lling.univ-nantes.fr/ > > > >______________________________________________ > >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. -- - - Catalin-Constantin ROIBU Lecturer PhD, Forestry engineer Forestry Faculty of Suceava Str. Universitatii no. 13, Suceava, 720229, office phone +4 0230 52 29 78, ext. 531 mobile phone +4 0745 53 18 01 +4 0766 71 76 58 FAX: +4 0230 52 16 64 silvic.usv.ro <http://www.usv.ro/> [[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.