-------------------------------------------------------------------------------- Fedora Update Notification FEDORA-2018-c8faeba623 2018-04-04 16:46:04.885046 --------------------------------------------------------------------------------
Name : R-bit Product : Fedora 26 Version : 1.1.12 Release : 2.fc26 URL : https://cran.r-project.org/web/packages/bit/index.html Summary : A class for vectors of 1-bit booleans Description : bitmapped vectors of booleans (no NAs), coercion from and to logicals, integers and integer subscripts; fast boolean operators and fast summary statistics. With 'bit' vectors you can store true binary booleans {FALSE,TRUE} at the expense of 1 bit only, on a 32 bit architecture this means factor 32 less RAM and ~ factor 32 more speed on boolean operations. Due to overhead of R calls, actual speed gain depends on the size of the vector: expect gains for vectors of size > 10000 elements. Even for one-time boolean operations it can pay-off to convert to bit, the pay-off is obvious, when such components are used more than once. Reading from and writing to bit is approximately as fast as accessing standard logicals - mostly due to R's time for memory allocation. The package allows to work with pre-allocated memory for return values by calling .Call() directly: when evaluating the speed of C-access with pre-allocated vector memory, coping from bit to logical requires only 70% of the time for copying from logical to logical; and copying from logical to bit comes at a performance penalty of 150%. the package now contains further classes for representing logical selections: 'bitwhich' for very skewed selections and 'ri' for selecting ranges of values for chunked processing. All three index classes can be used for subsetting 'ff' objects (ff-2.1-0 and higher). -------------------------------------------------------------------------------- Update Information: Initial import of bit for R -------------------------------------------------------------------------------- References: [ 1 ] Bug #1553054 - Review Request: R-bit - A class for vectors of 1-bit booleans https://bugzilla.redhat.com/show_bug.cgi?id=1553054 -------------------------------------------------------------------------------- This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade R-bit' at the command line. For more information, refer to the dnf documentation available at http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label All packages are signed with the Fedora Project GPG key. More details on the GPG keys used by the Fedora Project can be found at https://fedoraproject.org/keys -------------------------------------------------------------------------------- _______________________________________________ package-announce mailing list -- [email protected] To unsubscribe send an email to [email protected]
