Message-ID: <47DBFD4C.6090007@u-paris10.fr>
Date: 2008-03-15T16:46:04Z
From: Christophe Genolini
Subject: empty array
In-Reply-To: <540581.49306.qm@web32806.mail.mud.yahoo.com>
John Kane a ?crit :
> Will
> mymatrix <- NULL do what you want?
>
Well, in your code, 'mymatrix' is not a matrix :
a<-array(dim=c(0,0)) # Solution of Gabor Csardi
<0 x 0 matrix>
class(a)
[1] "matrix"
b<-NULL
class(b)
[1] "NULL"
Your definition will probably works in most case, but in S4, the uses of
type is an important point, so I need to use matrix where I shall use
matrix, even if it is an empty one.
Christophe
> --- Christophe Genolini <cgenolin at u-paris10.fr> wrote:
>
>
>> Hi the list
>>
>> Is it possible to create an empty matrix ? I do not
>> mean an matrix with
>> a single value that is NA (which is not empty) but a
>> real empty one,
>> with length=0.
>>
>> I do not understand why we have length(numeric()),
>> length(factor()) and
>> length(character()) to zero, and length(array()) to
>> one... Any rason for
>> that ?
>>
>> Thanks
>>
>> Christophe
>>
>> ______________________________________________
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>> https://stat.ethz.ch/mailman/listinfo/r-help
>> 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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