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R 2.2.1 の変更点
o Use of 'pch' (e.g. in points) in the symbol font 5 is now interpreted in the single-byte encoding used by that font. Similarly, strwidth now recognizes that font 5 has a different encoding from that of the locale. (These are likely to affect the answer only in MBCS locales such as UTF-8.)
o The malloc's of AIX and OSF/1 which return NULL for size 0 are now catered for in src/main/regex.c.
o Indexing by character NA matched the name "NA".
o The arith-true test used random inputs and did not set the seed, so it could fail very occasionally.
o arima() with 'fixed' supplied and p=0 for the non-seasonal part could give spurious warnings about 'some AR parameters were fixed'.
o Conversion from POSIXct to POSIXlt is done more accurately around the change of DST in years not supported by the OS (pre-1970 on Windows and some others, and in the far past or future).
o image() was failing with an error when plotting a matrix of all NA values. (PR#8228)
image() could fail if called with add=FALSE (the default) and length(x)=1 for either x or y, as it uses the plot coordinates of the previous plot (if any).
o The plot() method for TukeyHSD() needed updating after adding adjusted p-values. (PR#8229)
o is.loaded() now finds Fortran symbols whether or not the registration mechanism has been used.
o ISODateTime() mistakenly corrected non-existent times (when DST was being started) in the current time zone.
o getGraphicsEvent() would cause memory corruption if passed an empty prompt.
o qr() and chol() now pivot the colnames of the result when pivoting is used. (PR#8258)
o example(points) omitted pch=0, although it was valid and said in the text to be illustrated.
o plot.default() had an unused 'lab' argument, thereby preventing the 'lab' graphics parameter being passed through '...' .
o Although polygon(col = NA) was the stated default, specifying NA was not equivalent to omitting the argument (but col=NULL was equivalent).
o aggregate.ts() did not allow for rounding in frequencies such as 1/5.
o prcomp(tol=) was not dropping the sdev's corresponding to dropped columns.
o Subassignment of a vector which increased the length of the vector _and_ had the wrong length of replacement could occasionally segfault. (This has been there since at least mid 1997.)
o The registration of .Fortran symbols was broken: these could only be looked up if there were also .Call symbols registered!
o R CMD build was incorrectly rejecting the recommended form of name for a translation package, 'Translation-ll'. (PR#8314)
o numericDeriv() gave nonsense results unless the variables were real, which was not checked.
o predict.prcomp() would sometimes give an error when predicting a single observation. (PR#8324)
o The arith-true test used identical() on floating-point results, and this allowed a failure when the relative difference was less than .Machine$double.eps but non-zero.
o Conversion of .Rd files did not correctly match braces
enclosing a whole argument, e.g. \eqn{{\bf a}}{a}.
o The C function pythag (used if hypot was not available) would infinite-loop on systems with effective optimizing compilers.
o Both the R front-end and INSTALL could find the attempted temporary directory name already in use on platforms without mktemp (and a genuine Bourne shell /bin/sh, not bash). Now both the process ID and a timestamp are used to create the directory name.
o t() now longer drops dimnames 'list(NULL,NULL)' or 'list(NULL)'.
o Influence measures such as rstandard() and cooks.distance() could return infinite values rather than NaN for a case which was fitted exactly. Similarly, plot.lm() could fail on such examples. plot.lm(which = 5) had to be modified to only plot cases with hat < 1. (PR#8367)
lm.influence() was incorrectly reporting 'coefficients' and 'sigma' as NaN for cases with hat = 1, and on some platforms not detecting hat = 1 correctly.
o nlminb() used an uninitialized variable unless bounds were supplied, and so failed on 64-bit Solaris.
