/usr/lib/R/library/rpart/NEWS.Rd is in r-cran-rpart 4.1-5-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 | \name{NEWS}
\title{NEWS file for the rpart package}
\section{Changes in version 4.1-0}{
\itemize{
\item The C and R code has been reformatted for legibility.
\item The old compatibility function \code{rpconvert()} has been removed.
\item The cross-validation functions allow for user interrupt at the
end of evaluating each split.
\item Variable \code{Reliability} in data set \code{car90} is
corrected to be an ordered factor, as documented.
\item Surrogate splits are now considered only if they send two or
more cases \emph{with non-zero weight} each way. For
numeric/ordinal variables the restriction to non-zero weights is
new: for categorical variables this is a new restriction.
\item Surrogate splits which improve only by rounding error over the
default split are no longer returned. Where weights and missing
values are present, the \code{splits} component for some of these
was not returned correctly.
}
}
\section{Changes in version 4.0-3}{
\itemize{
\item A fit of class \samp{"rpart"} now contains a component for
variable \sQuote{importance}, which is reported by the
\code{summary()} method.
\item The \code{text()} method gains a \code{minlength} argument,
like the \code{labels()} method. This adds finer control: the
default remains \code{pretty = NULL}, \code{minlength = 1L}.
\item The handling of fits with zero and fractional weights has been
corrected: the results may be slightly different (or even
substantially different when the proportion of zero weights is
large).
\item Some memory leaks have been plugged.
\item There is a second vignette, \file{longintro.Rnw}, a version of
the original Mayo Tecnical Report on \pkg{rpart}.
}
}
\section{Changes in version 4.0-2}{
\itemize{
\item Added dataset \code{car90}, a corrected version of the
S-PLUS dataset \code{car.all} (used with permission).
\item This version does not use \code{paste0{}} and so works
with \R 2.14.x.
}
}
\section{Changes in version 4.0-1}{
\itemize{
\item Merged in a set of Splus code changes that had accumulated at
Mayo over the course of a decade. The primary one is a change in how
indexing is done in the underlying C code, which leads to a major
speed increase for large data sets. Essentially, for the lower
leaves all our time used to be eaten up by bookkeeping, and this was
replaced by a different approach. The primary routine also uses
\code{.Call{}} so as to be more memory efficient.
\item The other major change was an error for asymmetric loss
matrices, prompted by a user query. With L=loss asymmetric, the
altered priors were computed incorrectly -- they were using L'
instead of L. Upshot -- the tree would not not necessarily choose
optimal splits for the given loss matrix. Once chosen, splits were
evaluated correctly. The printed \dQuote{improvement} values are of
course the wrong ones as well. It is interesting that for my little
test case, with L quite asymmetric, the early splits in the tree are
unchanged -- a good split still looks good.
\item Add the \code{return.all} argument to \code{xpred.rpart()}.
\item Added a set of formal tests, i.e., cases with known answers to
which we can compare.
\item Add a \file{usercode} vignette, explaining how to add user defined
splitting functions.
\item The class method now also returns the node probability.
\item Add the \code{stagec} data set, used in some tests.
\item The \code{plot.rpart} routine needs to store a value that will
be visible to the \code{rpartco} routine at a later time. This is
now done in an environment in the namespace.
}
}
\section{Changes in version 3.1-55}{
\itemize{
\item Force use of registered symbols in R >= 2.16.0
\item Update Polish translations.
\item Work on message formats.
}
}
\section{Changes in version 3.1-54}{
\itemize{
\item Add Polish translations
}
}
\section{Changes in version 3.1-53}{
\itemize{
\item \code{rpart}, \code{rpart.matrix}: allow backticks in formulae.
\item \file{tests/backtick.R}: regession test
}
}
\section{Changes in version 3.1-52}{
\itemize{
\item \file{src/xval.c}: ensure unused code is not compiled in.
}
}
\section{Changes in version 3.1-51}{
\itemize{
\item Change description of \samp{margin} in \code{?plot.rpart}
as suggested by Bill Venables.
}
}
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