I've just committed a fix to the zoo svn repository. You can grab it like
this:
source("http://r-forge.r-project.org/plugins/scmsvn/viewcvs.php/*checkout*/pkg/R/merge.zoo.R?rev=575&root=zoo")
On Sun, Mar 15, 2009 at 2:54 AM, Ajay Shah <ajayshah at mayin.org>
wrote:> Folks,
>
> I often build up R objects starting from NULL and then repeatedly
> using rbind() or cbind(). This yields code like:
>
> a <- NULL
> for () {
> ?onerow <- craft one more row
> ?a <- rbind(a, onerow)
> }
>
> This works because rbind() and cbind() are forgiving when presented
> with a NULL arg: they act like nothing happened, and you get
> all.equal(x,rbind(NULL,x)) or all.equal(x,cbind(NULL,x)).
>
> This same idea is useful in building up a zoo matrix, by cbinding one
> column after another. I find this quite elegant, though I'm conscious
> that it leads to a lot of expensive memory management.
>
> This approach breaks around zoo because cbind(NULL,z) doesn't work:
>
> ?> tmp <- structure(c(2.65917577210146, 1.17190441781228,
0.838363890267146,
> ? ? ? ? ? ? -0.293979039853021, -0.132437820890186,
> ? ? ? ? ? ? ?0.262002985990861, ?2.16601367541420,
> ? ? ? ? ? ? ?0.375245019370496, ?0.0108451048014047,
> ? ? ? ? ? ? ?1.56555812127923), index = structure(c(12509,
> ? ? ? ? ? ? ?12510, 12513, 12514, 12515, 12516, 12521, 12524, 12528,
> ? ? ? ? ? ? ?12529), class = "Date"), class = "zoo")
> ?> tmp
> ? 2004-04-01 ?2004-04-02 ?2004-04-05 ?2004-04-06 ?2004-04-07 ?2004-04-08
> ? 2.65917577 ?1.17190442 ?0.83836389 -0.29397904 -0.13243782 ?0.26200299
> ? 2004-04-13 ?2004-04-16 ?2004-04-20 ?2004-04-21
> ? 2.16601368 ?0.37524502 ?0.01084510 ?1.56555812
> ?> cbind(NULL,tmp)
> ? ? ? ?12509 ? ? ? 12510 ? ? ? 12513 ? ? ? 12514 ? ? ? 12515 ? ? ? 12516
> ? 2.65917577 ?1.17190442 ?0.83836389 -0.29397904 -0.13243782 ?0.26200299
> ? ? ? ?12521 ? ? ? 12524 ? ? ? 12528 ? ? ? 12529
> ? 2.16601368 ?0.37524502 ?0.01084510 ?1.56555812
> ?Warning message:
> ?In merge.zoo(..., all = all, fill = fill, suffixes = suffixes, retclass =
"zoo") :
> ? ?Index vectors are of different classes: integer Date
>
> Is there an easy workaround; or am I deeply confused; is there a way
> out? :-)
>
> --
> Ajay Shah ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
?http://www.mayin.org/ajayshah
> ajayshah at mayin.org ? ? ? ? ? ? ? ? ? ? ? ? ? ?
http://ajayshahblog.blogspot.com
> <*(:-? - wizard who doesn't know the answer.
>
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