[R] Error with rbind and zoo

[Gabor Grothendieck]

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On Jan 7, 2008 7:09 PM, Kondamani, Arjun (GMI - NY Corporate Bonds)
<arjun_kondamani at ml.com> wrote:
> Hi all:
>
> I have a directory of files as in -------------> bunchafiles <-
> list.files(path="/data/2.3/2006", pattern="returns",
> full.names=T,recursive=T)  .... Each file is a bunch of returns for a
> particular date (unique). There are like 252 files or so.
>
> With a custom function myread (below), I define a vector ----- res <-
> vector("list",length=length(bunchafiles)) , and read files into it ----
> res <- lapply(bunchafiles, myread)
>
> myread <- function (x) {
>  y <- read.csv(x, as.is=T, header=T)
>  if (nrow(y) > 0) {
>    quotedate <-
> strsplit(strsplit(x,"/",fixed=T)[[1]][11],".",fixed=T)[[1]][1]
>    a <- rep(quotedate, nrow(y))
>    y <- zoo(y,a)
>  }
>  return(y)
> }
>
> I now have a list of zoo'd files. Each of them is indexed by a date
> which is unique. All fine so far.
>
> Now, I want to combine all of these into one large zoo object. So I say
> ------  bigzoo <- do.call(rbind, res)
>
> I now get an error .... "rbind(...): indexes overlap"... I am now
> wondering how? Because when I do the foll -----  for (i in
> 1:length(res)) {cat(i," ",unique(index(res[i][[1]])),"\n")}
> I see that I have unique indexes for each res.... So why is rbind
> behaving thus?
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