Re: [Rd] serialize changes for 2.4.0

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Tue 05 Sep 2006 - 20:39:54 GMT

NEW FEATURES

    o	serialize(connection = NULL) now returns a raw vector (and not
	a character string).  unserialize() accepts both old and new
	formats (and has since 2.3.0).

serialize.Rd:

  The function \code{serialize} writes \code{object} to the specified   connection. Sharing of reference objects is preserved within the   object but not across separate calls to serialize. If   \code{connection} is \code{NULL} then \code{object} is serialized to a

  raw vector, which is returned as the result of \code{serialize}.
  ^^^^^^^^^^

\section{Warning}{
  These functions are still experimental. Names, interfaces and   values might change in future versions (and was changed for \R 2.4.0).   \code{.saveRDS} and \code{.readRDS} are intended for internal use. }

\examples{
x <- serialize(list(1,2,3), NULL)
unserialize(x)
## test pre-2.3.0 interface as a length-one character vector y <- rawToChar(x)
unserialize(y)
}

all seem clear enough to me ..., including the statement about being experimental.

On Tue, 5 Sep 2006, Roger D. Peng wrote:

> I noticed today that in R 2.3.1, I get
>
> > serialize(list(1,2,3), NULL, ascii = TRUE)
> [1] "A\n2\n131841\n131840\n19\n3\n14\n1\n1\n14\n1\n2\n14\n1\n3\n"
> >
>
> but in R 2.4.0 alpha I get
>
> > serialize(list(1,2,3), NULL, ascii = TRUE)
> [1] 41 0a 32 0a 31 33 32 30 39 36 0a 31 33 31 38 34 30 0a 31 39 0a 33 0a 31 34
> [26] 0a 31 0a 31 0a 31 34 0a 31 0a 32 0a 31 34 0a 31 0a 33 0a
> >
>
> It seems I need to use 'rawToChar()' to get the character vector that I used to
> get in R 2.3.1.
>
> Is this intentional? I couldn't find any mention of this change in the NEWS
> file; from the docs, it seems to me that either return value could be correct.
>
> > version
> _
> platform x86_64-unknown-linux-gnu
> arch x86_64
> os linux-gnu
> system x86_64, linux-gnu

> status alpha
> major 2
> minor 4.0
> year 2006
> month 09
> day 05
> svn rev 39121
> language R
> version.string R version 2.4.0 alpha (2006-09-05 r39121)
> >
>
> -roger
>

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
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

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