On Wed, 5 Dec 2007, [EMAIL PROTECTED] wrote: > Consider the following: >> A <- 1:10 >> A > [1] 1 2 3 4 5 6 7 8 9 10 >> dim(A) > NULL >> dim(A) <- c(2,5) >> A > [,1] [,2] [,3] [,4] [,5] > [1,] 1 3 5 7 9 > [2,] 2 4 6 8 10 >> dim(A) > [1] 2 5 >> dim(A) <- 10 >> A > [1] 1 2 3 4 5 6 7 8 9 10 >> dim(A) > [1] 10 > > Would it not make sense to have dim(A) = length(A) for all vectors?
No. A one-dimensional array and a vector are not the same thing. There are subtle differences, such as what names() means (see ?names). That a 1D array and a vector _print_ in the same way does occasionally lead to confusion, but then you also cannot tell from your printout that A has type "integer" and not "double". -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ 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.
