Version 0.60 of R for Unix is now available. Release of this version
has been delayed for a variety of reasons, but we hope that it will
provide a good deal more stability and functionality than previous
versions. However it should be regarded as of "alpha" quality for a
short shakedown period.
We would like user feedback to help us improve the quality of R.
You can do this by subscribing to the r-devel mailing list by sending
a message containing
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(in the "body", not the subject!) to:
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Version 0.60 or R may be obtained from the following sites:
TU Wein, Austria
ftp://ftp.ci.tuwien.ac.at/pub/R
IASC archive, Italy
http://www.stat.unipg.it/pub/stat/statlib/R/CRAN/contents.html
University of Aizu, Japan
ftp://ftp.u-aizu.ac.jp/pub/lang/R/CRAN/contents.html
ETH Zurich, Switzerland
ftp://ftp.stat.math.ethz.ch/R-CRAN/contents.html
Statlib, Carnegie Mellon University, USA
http://lib.stat.cmu.edu/R/CRAN/contents.html
University of Washington, USA
ftp://ftp.biostat.washington.edu/mirrors/R/CRAN/contents.html
University of Wisconsin, USA
http://franz.stat.wisc.edu/pub/R/contents.html
There are some large changes to R with this version (additional large
changes are planned for further versions). In particular, the
documentation format has changed and the general standard of
documentation improved a good deal. Perl version 5 is now required to
process the documentation, but pre-formatted versions will be
available.
R is now being developed by a larger group than its original authors.
In particular, this release represents the direct efforts of the
following group:
Peter Dalgaard, Robert Gentleman, Kurt Hornik, Ross Ihaka,
Thomas Lumley, Friedrich Leisch, Martin Maechler, Paul Murrell,
Heiner Schwarte and Luke Tierney.
In addition, hundreds of contributions, in the form of code, patches
and bug reports, have been made by a much larger group of indiviuals.
R is now a GNU project and will be making changes to meet GNU coding
and installation standards.
A detailed list of changes follows.
NEW FEATURES
o There has been a major change in directory structure masterminded
by Kurt Hornik.
library(.) now attaches ``package''s which are better
integrated, see "?library". Packages may be available from
outside the RHOME path via the .lib.loc variable.
o The documentation format (of files in src/library/<package>/man/ )
has changed to a more easily parsable LaTeX like format.
The doc files now all end in `.Rd'.
etc/Rman2Rd can be used to translate old-style documentation to
the new one.
The translation to *roff, LaTeX and HTML is now done using
etc/Rdconv, written in Perl by Fritz Leisch.
The HTML online help produced has now links which work.
The manual (in doc/manual/) now includes a section on the
documentation format and on mathematical text in graphs.
etc/ further contains `Sd2Rd' for (partial) translation of S `.d'
documentation to Rd, and
`Rd2txt' and `Rd2dvi' for easy previewing of single Rd files.
o The use of "names" on one dimensional arrays will now produce
sensible results. This means that for most purposes,
one dimensional arrays can be treated like vectors.
o We have a applied a patch from mward at wolf.hip.berkeley.edu
which should substantially improve the speed of (vector)
arithmetic.
o The modeling formula handler has been expanded so that it
accepts y ~ 0 + x as a "through the origin" specification.
models with no parameters are now acceptable.
o "cov", "cor" and "var" now produce a matrix
result if either
of their x or y arguments is a matrix. Dimnames are propagated
in a sensible fashion.
o New chisq.test(.) and prop.test() from Kurt Hornik.
o New read.fwf(.) for reading fixed width format (KH).
o New str(.) [alternative to summary(.) for programmers] (MM).
o New example data sets "esoph", "infert" and
"anscombe" (TL),
"iris3" (KH) and "stackloss" (MM).
o source(.) has several new arguments, notably ``echo = FALSE''.
This is applied in the new function demo(.) which runs all the
code in demos/ (but dynload).
o strheight(.) is new, accompanying strwidth(.).
Both now work for mathematical expressions (Paul Murrell).
o The LaTeX version of the manual (-> doc/manual/) now has an index.
o EVERY *.Rd file in src/library/base/man/ has now at least one \keyword
o New package (`library(.)') "stepfun" for step functions,
incl.
empirical distributions.
BUG FIXES
o Regular expression matching is now done with system versions
of the regexp library. This should fix compilation problems
on some platforms.
o "approx" and "approxfun", have had some minor
adjustments.
which fix the interpretation of the rule= argument. The
code for piecewise constant case is now internal C code
that than interpreted. This should boost performance in
this case.
o There has been a minor fixup of "model.frame" to ensure that
subsets, weights, etc are handled properly.
o Model fitting of the form
lm(y~., data=df)
glm(y~., data=df)
will now work. The RHS of the model will consist of an
additive model containing all (non-respose) variabels in the
given data frame.
o The following type of assignment to data frame subsets
z <- data.frame(x=rnorm(10),y=rnorm(10),z=rnorm(10))
z[,1:2] <- matrix(1:20,nc=2)
was producing incorrect results. The solution was to wrap
an implicit "as.data.frame" around the RHS.
o "[.data.frame" no longer has a default drop=TRUE argument.
This means that subsetting a data frame with "[" will always
yield a data frame.
o There was a swap of coordinates internally in "mtext" which
meant that labels were coming out in the wrong place. Fixed.
o Syntax errors in parse(text="...") would cause R to terminate
with a segmentation violation. This no longer happens, although
the result is still not perfect (the parse() returns).
This will be fixed by a future parse rewrite.
o rainbow, topo.colors, etc., now also work with n in {1,2};
don't return duplicate neighbor colors anymore.
o legend has new `text.width' argument and now also works with
mathematical expressions as text.
o hist() now works better, has a `plot = TRUE' argument, and returns
something useful.
o barplot() improved for `names', now returns vector of midpoints.
o lm(), lm.fit, lm.wfit (was `lm.w.fit'): Made more compatible.
Dealing with (close to) collinear situations is still not flexible
enough.
o internal postcript() improved (missing lines in boxplot(.)).
o Improvement to many (even most ?) documentation (.Rd) files.
o Numerous other fixes of minor things ...
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