[R-br] Para quem eh fa~ de "bleeding-edge tech" (em termos de R)

[Benilton Carvalho]

As promessas sobre as quais comentei em algum ponto no passado (de que
o R-core iria incorporar suporte a objetos mais longos que 2^31-1)
comecam a ser cumpridas.... Eu imagino que no R-2.16.x eh possivel que
jah tenhamos alguma dessa funcionalidade (lembrem-se que o release
schedule do R mudou e agora eh apenas 1x por ano)...

Enfim, o texto abaixo informa as mudancas que ja' foram feitas no codigo-fonte.

b


  \subsection{LONG VECTORS}{
    \itemize{
      \item There are the beginnings of support for vectors longer than
      \eqn{2^{31}-1}{2^31 - 1} elements on 64-bit platforms.  This
      applies to raw, logical, integer, double, complex and character
      vectors, as well as lists.  (Elements of character vectors remain
      limited to \eqn{2^{31}-1}{2^31 - 1} bytes.)

      \item What can be done with such vectors is currently very
      limited, and most operations will return the error \sQuote{long
      vectors not supported yet}.  They can be serialized and
      unserialized, \code{identical()} and \code{object.size()} work and
      means can be computed.

      \item \code{dist()} can produce dissimilarity objects for more
      than 65536 rows (but for example \code{hclust()} cannot process
      such objects).

      \item \code{serialize()} to a raw vector is no longer limited in
      size on 64-bit platforms.

      \item The C-level function \code{R_alloc} can now allocate
      \eqn{2^{34}}{2^34} or more bytes on 64-bit platforms.
    }
  }