[R] tail.matrix returns matrix, while tail.mts return vector
matthieu.stigler at gmail.com
Sun Sep 5 10:23:02 CEST 2010
Indeed this is the workaround I had found, but not very practical as it
fails on univariate series, so you should know before which class is the
object... I feel a head.mts would make sense, or did I misunderstand
Le 04. 09. 10 16:09, Ista Zahn a écrit :
> Hi Mat,
> You might be able to use the matrix method to get what you want.
> On Sat, Sep 4, 2010 at 1:15 PM, mat<matthieu.stigler at gmail.com> wrote:
>> I have a few problems with tail/head when applied to multiple time series.
>> I'm not sure as whether I did not understand the function or whether it
>> correspond to an unexpected behavior.
>> When head(a,n) is applied on data.frame or matrix, it returns a data-frame
>> or matrix with first n obs of *each* variable. When applied to a mts object,
>> it returns first n obs of *first* variable only, not of all... The same for
>> tail(). See:
>> ###mts object
>> #is equivalent to:
>> I guess it comes from absence of a head method for mts. Does it seem
>> reasonable to have also a head.mts or did I misunderstand something?
>> R-help at r-project.org mailing list
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
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