Daniel Høyer Iversen wrote: >> That's confusing! In what situations is x a matrix but does not have >> a dim attribute? >> > > That was my point. I don't find it logical that > is.matrix(a) gives FALSE but > is.matrix(t( t(a) )) gives TRUE. > that's a different story, because t() performs an implicit cast from vector to matrix, so you have
t(vector) -> matrix t(matrix) -> matrix t(t(vector)) -> matrix interestingly, x = 1:2 dim(x) = 2 adds "matrix" to is(x), but it is still not is.matrix(x) (consistently with the docs). > I also think it would be more logical that > a=c(1,1,2) > dim(a) gives 3 1 instead of NULL, > well, it might give 3 1 1, or 3 1 1 1, or ..., which all could be considered logical. i think dim(x) giving just 3 would be fine. vQ ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
