From ripley at stats.ox.ac.uk  Wed May 31 16:30:55 2006
From: ripley at stats.ox.ac.uk (Prof Brian Ripley)
Date: Wed, 31 May 2006 15:30:55 +0100 (BST)
Subject: [Rd] Inconsistent behaviour when manipulating a ts object with
 frequency = 12 or 4
In-Reply-To: <3c12769c0605310641r61bf60fbl3d82e2364bd2dc5d@mail.gmail.com>
References: <3c12769c0605310641r61bf60fbl3d82e2364bd2dc5d@mail.gmail.com>
Message-ID: <Pine.LNX.4.64.0605311528130.4180@gannet.stats.ox.ac.uk>

Attempting to change element 24 of a length 6 time series is inconsistent!
You end up with an invalid series, and the print methods are different for 
different frequencies, hence different error messages.

Please do not send the same post repeatedly!

On Wed, 31 May 2006, Simone Giannerini wrote:

> Dear All,
>
> I found the following  under R 2.3.0 on WINXP (tested on 2 PCs, I do
> not have access to Linux from this PC, sorry ... )
>
>> set.seed(10)
>> x <- ts(rnorm(6),frequency=7)
>> x
> Time Series:
> Start = c(1, 1)
> End = c(1, 6)
> Frequency = 7
> [1]  0.01874617 -0.18425254 -1.37133055 -0.59916772  0.29454513  0.38979430
>> x[24] <- NA
>> x
> Time Series:
> Start = c(1, 1)
> End = c(1, 6)
> Frequency = 7
> [1]  0.01874617 -0.18425254 -1.37133055 -0.59916772  0.29454513
> 0.38979430          NA          NA          NA          NA          NA
> [12]          NA          NA          NA          NA          NA
>   NA          NA          NA          NA          NA          NA
> [23]
> ## OK ********************
>
>> x <- ts(rnorm(6),frequency=12) # THE SAME BUT WITH frequency = 12
>> x
>         Jan        Feb        Mar        Apr        May        Jun
> 1 -1.2080762 -0.3636760 -1.6266727 -0.2564784  1.1017795  0.7557815
>> x[24] <- NA
>> x
> Error in matrix(c(rep.int("", start.pad), format(x, ...), rep.int("",  :
>        length of 'dimnames' [1] not equal to array extent
> In addition: Warning message:
> data length [30] is not a sub-multiple or multiple of the number of
> columns [12] in matrix
>
>> x <- ts(rnorm(6),frequency=4) # THE SAME BUT WITH frequency = 4
>> x
>         Qtr1        Qtr2        Qtr3        Qtr4
> 1 -0.23823356  0.98744470  0.74139013  0.08934727
> 2 -0.95494386 -0.19515038
>> x[24] <- NA
>> x
> Error in matrix(c(rep.int("", start.pad), format(x, ...), rep.int("",  :
>        length of 'dimnames' [1] not equal to array extent
> In addition: Warning message:
> data length [26] is not a sub-multiple or multiple of the number of
> rows [7] in matrix
>
>
> Is this behaviour expected for frequencies 12 and 4?
>
> Thank you
>
> Simone
>
> ***************************************************
> platform       i386-pc-mingw32
> arch           i386
> os             mingw32
> system         i386, mingw32
> status
> major          2
> minor          3.0
> year           2006
> month          04
> day            24
> svn rev        37909
> language       R
> version.string Version 2.3.0 (2006-04-24)
>
>> Sys.getlocale()
> [1] "LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
> States.1252;LC_MONETARY=English_United
> States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252"
>
> ______________________________________________________
>
> Simone Giannerini
> Dipartimento di Scienze Statistiche "Paolo Fortunati"
> Universita' di Bologna
> Via delle belle arti 41 - 40126  Bologna,  ITALY
> Tel: +39 051 2098248  Fax: +39 051 232153
>
> ______________________________________________
> 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] Inconsistent behaviour when manipulating a ts object with frequency = 12 or 4
Prof Brian Ripley