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 <[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 have length(numeric()), >> length(factor()) and >> length(character()) to zero, and length(array()) to >> one... Any rason for >> that ? >> >> Thanks >> >> Christophe >> >> ______________________________________________ >> R-help@r-project.org mailing list >> 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. >> >> > > > > Be smarter than spam. See how smart SpamGuard is at giving junk email > the boot with the All-new Yahoo! Mail. Click on Options in Mail and switch > to New Mail today or register for free at http://mail.yahoo.ca > > ______________________________________________ R-help@r-project.org mailing list 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.
