[datatable-help] v1.6.3 has been submitted to CRAN

[Chris Neff]

About how long from submission does it usually take for it to show up to CRAN?

On 3 August 2011 22:27, Matthew Dowle <mdowle at mdowle.plus.com> wrote:
> NEW FEATURES
>
>    o   Ad hoc grouping now returns results in the same order each
>        group first appears in the table, rather than sorting the
>        groups. Thanks to Steve Lianoglou for highlighting. The order
>        of the rows within each group always has and always will be
>        preserved. For larger datasets a 'keyed by' is still faster;
>        e.g., by=key(DT).
>
>    o   The 'key' argument of data.table() now accepts a vector of
>        column names in addition to a single comma separated string
>        of column names, for consistency. Thanks to Steve Lianoglou
>        for highlighting.
>
>    o   A new argument '.SDcols' has been added to [.data.table. This
>        may be character column names or numeric positions and
>        specifies the columns of x included in .SD. This is useful
>        for speed when applying a function through a subset of
>        (possibly very many) columns; e.g.,
>            DT[,lapply(.SD,sum),by="x,y",.SDcols=301:350]
>
>    o   as(character, "IDate") and as(character, "ITime") coercion
>        functions have been added. Enables the user to declaring
>        colClasses as "IDate" and "ITime" in the various read.table
>        (and sister) functions. Thanks to Chris Neff for the suggestion.
>
>    o   DT[i,j]<-value is now handled by data.table in C rather
>        than falling through to data.frame methods, FR#200. Thanks to
>        Ivo Welch for raising speed issues on r-devel, to Simon Urbanek
>        for the suggestion, and Luke Tierney and Simon for information
>        on R internals.
>
>        [<- syntax still incurs one working copy of the whole
>        table (as of R 2.13.1) due to R's [<- dispatch mechanism
>        copying to `*tmp*`, so, for ultimate speed and brevity,
>        the operator := may now be used in j as follows.
>
>    o   := is now available to j and means assign to the column by
>        reference; e.g.,
>
>            DT[i,colname:=value]
>
>        This syntax makes no copies of any part of memory at all.
>
>        m = matrix(1,nrow=100000,ncol=100)
>        DF = as.data.frame(m)
>        DT = as.data.table(m)
>
>        system.time(for (i in 1:1000) DF[i,1] <- i)
>             user  system elapsed
>          287.062 302.627 591.984
>
>        system.time(for (i in 1:1000) DT[i,V1:=i])
>             user  system elapsed
>            1.148   0.000   1.158     ( 511 times faster )
>
>        := in j can be combined with all types of i, such as binary
>        search. It can be used to add and remove columns efficiently,
>        too. Fast assigning within groups will be implemented in
>        future.
>
>        *Please note*, := is new and experimental.
>
>
> BUG FIXES
>
>    o   merge()ing two data.table's with user-defined `suffixes`
>        was getting tripped up when column names in x ended in
>        '.1'. This resulted in the `suffixes` parameter being
>        ignored.
>
>    o   Mistakenly wrapping a j expression inside quotes; e.g.,
>            DT[,list("sum(a),sum(b)"),by=grp]
>        was appearing to work, but with wrong column names. This
>        now returns a character column (the quotes should not
>        be used). Thanks to Joseph Voelkel for reporting.
>
>    o   setkey has been made robust in several ways to fix issues
>        introduced in 1.6.2: #1465 ('R crashes after setkey')
>        reported by Eugene Tyurin and similar bug #1387 ('paste()
>        by group to create long comma separated strings can crash')
>        reported by Nicolas Servant and Jean-Francois Rami. This
>        bug was not reproducible so we are especially grateful for
>        the patience of these people in helping us find, fix and
>        test it.
>
>    o   Combining a join, j and by together in one query now works
>        rather than giving an error, fixing bug #1468. Discovered
>        indirectly thanks to a post from Jelmer Ypma.
>
>    o   Invalid keys are no longer arise when a non-data.table-aware
>        package reorders the data; e.g.,
>            setkey(DT,x,y)
>            plyr::arrange(DT,y)       # same as DT[order(y)]
>        This now drops the key to avoid incorrect results being
>        returned the next time the invalid key is joined to. Thanks
>        to Chris Neff for reporting.
>
>
> USER-VISIBLE CHANGES
>
>    o   The startup banner has been shortened to one line.
>
>    o   data.table does not support POSIXlt. Almost unbelievably
>        POSIXlt uses 40 bytes to store a single datetime. If it worked
>        before, that was unintentional. Please see ?IDateTime, or any
>        other date class that uses a single atomic vector. This is
>        regardless of whether the POSIXlt is a key column, or not. This
>        resolves bug #1481 by documenting non support in ?data.table.
>
>
> DEPRECATED & DEFUNCT
>
>   o    Use of the DT() alias in j is no longer caught for backwards
>        compatibility and is now fully removed. As warned in NEWS
>        for v1.5.3, v1.4, and FAQs 2.6 and 2.7.
>
>
> http://datatable.r-forge.r-project.org/
>
>
>
>
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