[R] Package versions (was Reshape a sparse matrix)

[Prof Brian Ripley]

On Tue, 15 May 2007, Scott Hyde wrote:

>
> Thanks for the respons, Martin.  The program I wrote works as well for 
> doing the reshaping, but it is nice to have it built in.
>
> Is there a way to tell what version of Matrix is installed, and how do 
> we know when new releases are issued?  I installed Matrix fairly 
> recently, and thought I was up to date.

library(help=Matrix)  shows you the version.

If you want it programmatically, one way is
packageDescription("Matrix" , fields="Version")

update.packages()     offers you updates.
(It is possible that the mirror you use has not got 0.99875-1 yet,
especially if this is a binary install, e.g, Windows or MacOS X.  E.g. the 
Windows binary was only built yesterday afternoon.)

>
> -Scott
>
> ---- Original message ----
>> Date: Wed, 16 May 2007 09:32:44 +0200
>> From: Martin Maechler <maechler at stat.math.ethz.ch>
>> Subject: Re: [R] Reshape a sparse matrix
>> To: Scott Hyde <hydes at byuh.edu>
>> Cc: r-help at stat.math.ethz.ch
>>
>>>>>>> "Scott" == Scott Hyde <hydes at byuh.edu>
>>>>>>>     on Tue, 15 May 2007 17:03:13 -1000 (HST) writes:
>>
>>    Scott> Hi,
>>
>>    Scott> I'd like to reshape a sparse matrix generated from the Matrix package.  I can't seem to do it with the command
>>
>>    Scott> dim(A) <- c(6,9)
>>
>>    Scott> which works perfectly with the base package matrices, but with the sparse matrices it errors with
>>
>>    Scott> Error in dim(A) = c(6, 9) : dim<- : invalid first argument
>>
>> This *does* work in the current version of Matrix (0.99875-1), actually
>> already in version 0.99875-0 .
>>
>> In the next version of Matrix, it will not only work, but also
>> work "sparsely" internally via the new class "sparseVector" and
>> its daughter classes, on which I've been working during the last
>> 10 days or so...
>> Interesting that you bring the topic up right now ...
>>
>>
>>    Scott> Manipulating the Dim attribute of the sparse Matrix does not produce the desired effect. A at Dim <- c(as.integer(9),as.integer(6)) does not produce a column ordering result, which I am assuming is because the data is stored in a row (i) and column (j) format instead (class dgTMatrix)
>>
>> You should not have manipulate slots of S4 classes in general.
>> Some  people say that you should not even access them directly.
>>
>>    Scott> Does a function for this exist?
>>
>> yes, as I said above  dim(.) <- ..  works in the newest versions
>> of "Matrix".
>>
>> Regards,
>> Martin Maechler, ETH Zurich
>
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-- 
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)
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