Hello everyone
I know other, more knowledgeable, people
have replied to Christophe's question, but
perhaps the List would be interested to know
that zero-extent arrays are useful (to me at least)
because although such an array has no content, the
dimname are nevertheless retained:
a -
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
On Sat, Mar 15, 2008 at 04:33:32PM +0100, Christophe Genolini 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.
Sure:
matrix(nrow=0, ncol=5)
[,1] [,2] [,3]
On Sat, 15 Mar 2008, Gabor Csardi wrote:
On Sat, Mar 15, 2008 at 04:33:32PM +0100, Christophe Genolini 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.
Sure:
Will
mymatrix - NULL do what you want?
--- Christophe Genolini [EMAIL PROTECTED] 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
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
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