About how long from submission does it usually take for it to show up to CRAN?
On 3 August 2011 22:27, Matthew Dowle <[email protected]> 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/ > > > > > _______________________________________________ > datatable-help mailing list > [email protected] > https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help > _______________________________________________ datatable-help mailing list [email protected] https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help
