Package: bit
Type: Package
Title: A class for vectors of 1-bit booleans
Version: 1.0-2
Date: 2009-02-13
Author: Jens Oehlschlgel
Maintainer: Jens Oehlschlgel <oehl_list@gmx.de>
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. With this speed
        gain it even pays-off to convert to bit in order to avoid a
        single boolean operation on logicals or a single set operation
        on (longer) integer subscripts, the pay-off is dramatic 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%.
License: GPL-2
LazyLoad: yes
Encoding: latin1
Packaged: 2009-04-13 14:22:17 UTC; Jens Oehlschlaegel
Repository: CRAN
Date/Publication: 2009-04-15 07:33:07
