[R] tail.matrix returns matrix, while tail.mts return vector

Ista Zahn izahn at psych.rochester.edu
Sat Sep 4 16:09:29 CEST 2010

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:
> Hi
> 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:
> head(freeny)
> ###mts object
> head(EuStockMarkets)
> #is equivalent to:
> head(EuStockMarkets[,1])
> 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?
> Thanks
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Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology

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