Re: [R] empty array

From: Christophe Genolini <cgenolin_at_u-paris10.fr>
Date: Sat, 15 Mar 2008 17:46:04 +0100

John Kane a écrit :
> 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@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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>
>
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