hadley wickham wrote: > On Tue, Nov 11, 2008 at 1:42 PM, Wacek Kusnierczyk > <[EMAIL PROTECTED]> wrote: > >> hadley wickham wrote: >> >>>> | is.matrix| returns |TRUE| if |x| is a matrix and has a |dim <dim.html>| >>>> attribute of length 2) and |FALSE| otherwise >>>> >>>> >>> That's confusing! In what situations is x a matrix but does not have >>> a dim attribute? >>> >>> >>> >> x = matrix(1,1,1) >> dim(x) = c(1,1,1) >> > > I think you meant > dim(x) <- c(3, 1) > > You created a 1 x 1 x 1 array. >
i know, that's precisely what i wanted. this is a simple 3d structure, yet is(x) reveals it is a matrix. that was the point. some further observations: x = as.list(1:2) is(x) # x is a list dim(x) = 2 is.list(x) # sure is(x) # not so sure any more -- a matrix? vQ ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
