Re-read ?match and note the examples for %in% -- Bert Bert Gunter
"The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Mon, Oct 22, 2018 at 7:38 AM Knut Krueger <rh...@krueger-family.de> wrote: > > Hi to all > > I would like to reduce the "Mydata" to rows, only if Mydata$Data1 are in > needles > > > > needles =c(14390, 14391, 14392, 14427, 14428, 14429, 14430, 14431, > 14432, 14433, 14434, 14435, 14436, 14437, 14439, 14440, 14441, 15195, > 15196, 15197, 15198, 15199, 15200, 15201, 15202, 15203, 15204, 15205, > 15206, 15207, 15208, 15209, 17615, 17616, 17617, 17618, 17619, 17620, > 17621, 17622, 17623, 17624, 17625, 17626, 17627, 17628, 17629, 17630, > 17631, 17679, 17680, 17681, 17682, 17683, 17823, 17824, 17825, 17826, > 17827, 17828, 17829, 17830, 17831, 17862, 17863, 17864, 17865, 17866, > 17867, 17868, 17869, 17870, 17871, 17872, 17873, 17874, 17875, 17876, > 17877, 17878, 17879, 17880, 17881, 17882, 17883, 19255, 19256, 19257, > 19258, 21289, 21290, 21291, 21292, 22890, 22891, 22892, 22893, 22894, > 22895, 22896, 22897, 22898, 22899, 22900, 22901, 22902, 40428, 40429, > 40430, 40431, 40432, 40433, 40434, 40435, 40436, 40437) > > Haystack =c(14390, 14391, 14392, 14427, 14428, 14429, 14430, 14431, > 14432, 14433, 14434, 14435, 14436, 14437, 14439, 14440, 14441, 15187, > 15188, 15195, 15196, 15197, 15198, 15199, 15200, 15201, 15202, 15203, > 15204, 15205, 15206, 15207, 15208, 15209, 16717, 16718, 17615, 17616, > 17617, 17618, 17619, 17620, 17621, 17622, 17623, 17624, 17625, 17626, > 17627, 17628, 17629, 17630, 17631, 17679, 17680, 17681, 17682, 17683, > 17817, 17818, 17823, 17824, 17825, 17826, 17827, 17828, 17829, 17830, > 17831, 17862, 17863, 17864, 17865, 17866, 17867, 17868, 17869, 17870, > 17871, 17872, 17873, 17874, 17875, 17876, 17877, 17878, 17879, 17880, > 17881, 17882, 17883, 17886, 19255, 19256, 19257, 19258, 21289, 21290, > 21291, 21292, 22890, 22891, 22892, 22893, 22894, 22895, 22896, 22897, > 22898, 22899, 22900, 22901, 22902, 40428, 40429, 40430, 40431, 40432, > 40433, 40434, 40435, 40436, 40437, 40710, 40711, 49127, 49128, 52768) > > Mydata =data.frame (DATA1=Haystack, Data2=c(1:length(Haystack))) > > > > match(Mydata$DATA1, needles, nomatch=NA) does find all data which are in > needle - the others are set to the nomatch value. > > But I don not find out how to reduce the data.frame - maybe match() is > not helpful for that. > > Kind regards Knut > > ______________________________________________ > 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.
