From ripley at stats.ox.ac.uk  Wed May  9 16:00:14 2007
From: ripley at stats.ox.ac.uk (Prof Brian Ripley)
Date: Wed, 9 May 2007 15:00:14 +0100 (BST)
Subject: [Rd] fix() changes the class of mts objects
In-Reply-To: <3c12769c0705090615y3be14091w37bf6cc06bb01b0c@mail.gmail.com>
References: <3c12769c0705090615y3be14091w37bf6cc06bb01b0c@mail.gmail.com>
Message-ID: <Pine.LNX.4.64.0705091457250.6403@auk.stats>

Why did you expect otherwise?: fix() is treating it as matrix and 
?edit.matrix says that it only works on 'simple data frames' (and converts 
matrices to such).

Editing R objects can easily change aspects of them, as dput() is not 
faithful, environments can get lost and so on.

On Wed, 9 May 2007, Simone Giannerini wrote:

> Dear all,
>
> it looks like fix() changes the class of mts objects, here is a reproducible
> example (tested both on WinXP and Linux):
>
>> x <- ts(cbind(1:5,1:5))
>> x
> Time Series:
> Start = 1
> End = 5
> Frequency = 1
>  Series 1 Series 2
> 1        1        1
> 2        2        2
> 3        3        3
> 4        4        4
> 5        5        5
>> class(x)
> [1] "mts" "ts"
>> edit(x)
>     Series 1 Series 2
> [1,]        1        1
> [2,]        2        2
> [3,]        3        3
> [4,]        4        4
> [5,]        5        5
>> class(x)
> [1] "mts" "ts"
>> fix(x)
>> class(x)
> [1] "matrix"
>> x
>     Series 1 Series 2
> [1,]        1        1
> [2,]        2        2
> [3,]        3        3
> [4,]        4        4
> [5,]        5        5
>
>> R.version
>               _
> platform       i386-pc-mingw32
> arch           i386
> os             mingw32
> system         i386, mingw32
> status
> major          2
> minor          5.0
> year           2007
> month          04
> day            23
> svn rev        41293
> language       R
> version.string R version 2.5.0 (2007-04-23)
>
>> R.version
> platform       x86_64-unknown-linux-gnu
> arch           x86_64
> os             linux-gnu
> system         x86_64, linux-gnu
> status
> major          2
> minor          5.0
> year           2007
> month          04
> day            23
> svn rev        41293
> language       R
> version.string R version 2.5.0 (2007-04-23)
>
> ______________________________________________________
>
> Simone Giannerini
> Dipartimento di Scienze Statistiche "Paolo Fortunati"
> Universita' di Bologna
> Via delle belle arti 41 - 40126  Bologna,  ITALY
> Tel: +39 051 2098262  Fax: +39 051 232153
> ______________________________________________________
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595



[Rd] fix() changes the class of mts objects
Prof Brian Ripley