R-alpha: R Version 0.15

Ross Ihaka (ihaka@stat.auckland.ac.nz)
Thu, 19 Dec 1996 13:50:07 +1300 (NZDT)

From: Ross Ihaka <ihaka@stat.auckland.ac.nz>
Date: Thu, 19 Dec 1996 13:50:07 +1300 (NZDT)
Message-Id: <199612190050.NAA09973@stat2.stat.auckland.ac.nz>
To: r-testers <r-testers@stat.math.ethz.ch>
Subject: R-alpha: R Version 0.15

R Version 0.15 is now available from stat.auckland.ac.nz and soon from
our mirror sites.  Detailed changes are given in the CHANGES file which
is appended below.

This will probably be the last release of R for this year.  We'd like
to take the opportunity to thank everyone who has helped out and offered
encouragement.  We aren't there yet, but we have certainly come a long
way since version 0.1 at the start of the year.

Our present our development efforts are as follows:

1.  The "object system" code is being rewritten so that our
    implementation will match that of S.

2.  Complex arithmetic is being developed.

3.  The graphics code is being revised and extended.

4.  Support for the CODA system for MC^2 diagnostics is being
    developed. (Not much functionality is needed, but the CODA
    code really sucks and needs to be rewritten).

5.  "The R Language Reference Manual".

R + R



 *  New "abbreviate" function.

 *  New "density" function.  Note that this is NOT completely compatible
    with the S density function, so if you have problems take a peek at
    manual.  There are some associated functions for bandwidth choice
    which are derived from those in the Venables and Ripley MASS library.

 *  New "uniroot" and "optimize functions".

 *  New functions "cmdscale", "cancor" and "hclust" in the "mva" library.

 *  New "pictex" graphics driver from Valerio Aimalea.


 *  Missing return statement added to do_alldf.  Cures the infamous
    cbind bug.

 *  The assignment form of diag() is back again.

 *  If x is a list x[sub] <- NULL and x[[sub]] <- NULL now remove
    the specified elements from the list.  The first of these is
    incompatible with S.  In S, x[sub] <- NULL is a no-op.
    (This would be easy to change).

 *  The basic setup for time-series is now like that of S - except that
    we also attach class "ts" to time series.  I.e. the is a ts.eps and
    all that.

 *  Color cells are now freed by the X11 graphics driver at the start of
    a new plot (but there is a limit of 256 colors at any one time).
    We will put in mods for direct-color devices soon.

 *  Changes in the postscript graphics code to make string placement
    more precise.

 *  The apply function now makes some attempt to preserve dimnames.
    It still does not try as hard as S.

 *  "dump" of factors now does the right thing.  "structure" has also
    been updated to make it possible to import data which has been
    "dump"ed from S.

 *  Assigning NULL to a subset of a variable with value NULL no longer
    causes an error. 

 *  Parse produces objects which are more like those produced by
    the S version of parse.  They appear to be of mode expression
    but are in fact implemented as objects of "class" expression.

 *  When cat is passed a NULL argument it now behaves sensibly.

 *  Calls to ".C" and ".Fortran" can now specify up to 65 arguments.

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