It's just a guess from playing around with a few things. The author of the package is on this list and he could both confirm that I'm right and say why exactly it is implemented like this.
My hunch is that it ultimately comes from the fact that coredata(z) != z Consider this: x = letters[1:5] x2 <- x1 <- x mode(x) x1[1:5] <- 1:5 # Modify the values of x1 without changing the mode print(x1) x2 <- 1:5 # Replace x2 print(x2) Michael Weylandt On Tue, Sep 27, 2011 at 6:41 AM, Ashim Kapoor <ashimkap...@gmail.com> wrote: > Dear Michael, > > I don't think this is mentioned in the zoo FAQ. May I ask where you read > this? Some references ? > > Thank you for your help, > Ashim > > > On Tue, Sep 27, 2011 at 4:06 PM, R. Michael Weylandt < > michael.weyla...@gmail.com> wrote: > >> Yes, once made into a character zoo, the core data is marked to be of mode >> "character" and most attempts to modify involve implicit coercion to that >> mode. >> >> The following however works: >> >> library(zoo) >> >> z <- zoo(1:4, order.by=1:4) >> str(z) >> >> z.Str <- z >> coredata(z.Str) <- as.character(coredata(z)) >> str(z.Str) >> >> z.Num <- z.Str >> mode(z.Num) <- "numeric" >> str(z.Num) >> >> However, I prefer to use this sort of line of code: >> >> z.Num <- zoo(as.double(z.Str), index(z.Str)) >> >> finding it a little more transparent. >> >> Hope this helps, >> Michael Weylandt >> >> On Tue, Sep 27, 2011 at 5:56 AM, Ashim Kapoor <ashimkap...@gmail.com>wrote: >> >>> Dear R-helpers, >>> >>> It seems to me that a character zoo cannot be coerced to a numeric zoo. >>> Below is a minimal example. Can someone tell me what I have done wrong? >>> >>> > z<-zoo(1:4,order.by=1:4) >>> > coredata(z)<-as.character(coredata(z)) >>> > str(z) >>> zoo series from 1 to 4 >>> Data: chr [1:4] "1" "2" "3" "4" >>> Index: int [1:4] 1 2 3 4 >>> > coredata(z)<-as.numeric(coredata(z)) >>> > str(z) >>> zoo series from 1 to 4 >>> Data: chr [1:4] "1" "2" "3" "4" >>> Index: int [1:4] 1 2 3 4 >>> >>> >>> Many thanks, >>> Ashim >>> >>> [[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. >>> >>> >> > [[alternative HTML version deleted]]
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