On Mon, 24 Oct 2005, TB wrote: > Brian, > > Prof Brian Ripley <mailto:[EMAIL PROTECTED]> wrote: >> This is one of those undocumented things (AFAIK): LENGTH applies only >> to 'vectors'. So don't use t and definitely don't set it for others. >> The macro expands to >> >> #define LENGTH(x) (((VECSEXP) (x))->vecsxp.length) >> >> What is a vector here? Something which gets actually allocated by >> allocVector() AFAICS, that is an atomic or generic vector or an >> expression. OTOH, an EXTPTRSXP is stored in a cons cell. >> >> There is also a function length(), which is safer. > > Thanks for your message. Things are much clearer now to me. > > Can I safely assume that INTSXP, REALSXP, LGLSXP, STRSXP, CPLXSXP and VECSXP > are > vectors (while EXTPTRSXP is not).
Yes. RAWSXP and EXPRSXP are also vectors (and so in a sense is CHARSXP). Brian -- 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-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
