On Tue, Jul 31, 2012 at 2:40 AM, jpm miao <miao...@gmail.com> wrote: > Hi Michael, > > 1. I try this > > xzoo <- zoo() > > and it does work. OK, I will read the reference you provide to find > out why not to do so > > 2. How can I create an array of zoo objects?
I'm not quite sure what you mean by an array of zoo objects: the "data" of the zoo object can be a matrix so you can have rows and columns and all that. Alternatively you can stick the different zoo objects in a list (as you can with any R object) > > 3. Do you mean by "R's wisest virgil" Pat Burns' R Inferno? Well, Pat Burns himself really -- see, e.g., http://www.brown.edu/Departments/Italian_Studies/LD/numbers/04/hollander.html or less technically, http://www.shmoop.com/inferno/virgil.html. Michael > > To Arun: > > Even when indices (dates) of two zoo object don't match, I can cbind > them. It works for me! > > Thanks, > > Miao > > > > 2012/7/31 R. Michael Weylandt <michael.weyla...@gmail.com> >> >> On Mon, Jul 30, 2012 at 11:18 PM, jpm miao <miao...@gmail.com> wrote: >> > Hi, >> > >> > I let xzoo be an empty object: >> > >> >> xzoo<-{} >> >> This sounds like the start of a bad idea.... >> >> >> > >> > >> > and I have an existing zoo object x1zoo_f. I would like to combine >> > the two to make a new zoo object, and continue doing so in a loop, >> > which is not shown here. However, when I type >> > >> > >> >> xzoo<-cbind(xzoo, x1zoo_f) >> >> Yep: the real answer is "don't do that." Since R is >> copy-on-write+pass-by-reference and a few other nice things, this will >> be painfully gut-wrenchingly paint-dryingly slow :-) Much better is to >> make all your "x1zoo_f" objects and cbind them at once. >> >> The perils of this idea and the appropriate fixings thereof have been >> discussed here there and everywhere, but I think Pat Burn's >> presentation in "the R Inferno" is the best (and certainly the most >> fun) -- it's a worthwhile read and, perhaps an even higher compliment, >> a worthwhile re-read. >> >> Based on my rough memories of your recent posts, you won't understand >> it all in the first pass (few do -- I certainly don't), but over time >> you'll gain immensely from the work of one of R's wisest Virgils. >> >> >> > >> > >> > An error message emerges >> > >> > >> > Error in zoo(structure(x, dim = dim(x)), index(x), ...) : >> > “x” : attempt to define invalid zoo object >> > >> > >> > Is there any way to define an empty zoo object? >> > >> >> For completeness, >> >> xzoo <- zoo() >> >> But like I said: don't do that. >> >> Cheers, >> Michael >> >> >> > >> > Thanks, >> > >> > >> > Miao >> > >> > [[alternative HTML version deleted]] >> > >> > >> > ______________________________________________ >> > 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.
