Might I suggest looking in chemdata? You have supplied sample records from your original data file, but the transition from that to your result is still opaque. Try to generate a reproducible sequence of steps starting with your data that we can follow along with. Comment: you keep saying that the dates are not selected, but dates are not the only info missing; there are no records at all in the result. --------------------------------------------------------------------------- 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.
Rich Shepard <rshep...@appl-ecosys.com> wrote: > The data set (called 'chemdata') has 6 columns (4 factors, 1 date, 1 >numeric) and I need to create subsets for each of one of the factors >('stream'). This has worked flawlessly for all but two streams which >were >created yesterday. > > The command I use to create the subsets is like this: > >> rnchH <- subset(chemdata, stream == 'RanchSpgsH', select = c(site, >sampdate, >param, quant), drop = T) > >but it does not copy the dates in 'sampdate' for this and one other >subset: > >> str(rnchH) >'data.frame': 0 obs. of 4 variables: > $ site : Factor w/ 138 levels "BC-0.5","BC-1",..: > $ sampdate:Class 'Date' num(0) > $ param : Factor w/ 58 levels "AGP","ANP","ANP/AGP",..: > $ quant : num > > The source for chemdata (accessed by read.table()) has dates for this >stream; e.g., > >RNCHS|1994-03-23|pH|7.66|RanchSpgsH|H >RNCHS|1994-01-20|pH|7.66|RanchSpgsH|H > > If I use the same command on a different stream the sampdate column >contains the dates: > >> b2 <- subset(chemdata, stream == 'BurnsCrk', select = c(site, >sampdate, >param, quant), drop = T) >> str(b2) >'data.frame': 2472 obs. of 4 variables: >$ site : Factor w/ 138 levels "BC-0.5","BC-1",..: 5 5 5 5 5 5 5 5 5 >... > $ sampdate: Date, format: "1992-03-27" "1992-04-30" ... >$ param : Factor w/ 58 levels "AGP","ANP","ANP/AGP",..: 37 37 37 37 >... > $ quant : num 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 8.08 ... > >I keep looking to see why the first fails but have not found it. >Pointers >on where to look will be helpful. > >TIA, > >Rich > >______________________________________________ >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. ______________________________________________ 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.