Dear R users, just another little question... are there other ways, I mean more easy to write, to obtain the same result I got with: data[95:length(dati[,1]), ] where data is a data frame to extract the last elements starting from a fixed position? thank you very much best regards Manuele PEsenti -- Manuele Pesenti manuele a inventati.org amicogodzilla a jabber.linux.it http://mpesenti.polito.it
On Wed, 20 Jun 2007, Manuele Pesenti wrote:> Dear R users, > just another little question... are there other ways, I mean more easy to > write, to obtain the same result I got with: > > data[95:length(dati[,1]), ] > > where data is a data frame > > to extract the last elements starting from a fixed position?data[95:nrow(data), ] assuming 'data' and 'dati' are intended to be the same thing. (Easier to read, too, and correct even if data[,1] is a matrix.) -- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
Manuele Pesenti wrote:> Dear R users, > just another little question... are there other ways, I mean more easy to > write, to obtain the same result I got with: > > data[95:length(dati[,1]), ] > > where data is a data frame > > to extract the last elements starting from a fixed position? > > thank you very much > > best regards > Manuele PEsenti >Hello, tail can do it: R> tail( data, -95) Cheers, Romain -- Mango Solutions data analysis that delivers Tel: +44(0) 1249 467 467 Fax: +44(0) 1249 467 468 Mob: +44(0) 7813 526 123
Hi you can use tail tail(data, -95) gives you all but first 95 records. Regards Petr Pikal petr.pikal at precheza.cz r-help-bounces at stat.math.ethz.ch napsal dne 20.06.2007 12:47:11:> Dear R users, > just another little question... are there other ways, I mean more easyto> write, to obtain the same result I got with: > > data[95:length(dati[,1]), ] > > where data is a data frame > > to extract the last elements starting from a fixed position? > > thank you very much > > best regards > Manuele PEsenti > -- > Manuele Pesenti > manuele at inventati.org > amicogodzilla at jabber.linux.it > http://mpesenti.polito.it > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html> and provide commented, minimal, self-contained, reproducible code.