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Source: rcranbit
Maintainer: Debian R Packages Maintainers <rpkgteam@aliothlists.debian.net>
Uploaders: Andreas Tille <tille@debian.org>
Section: gnur
Testsuite: autopkgtestpkgr
Priority: optional
BuildDepends: debhelpercompat (= 13),
dhr,
rbasedev
StandardsVersion: 4.5.0
VcsBrowser: https://salsa.debian.org/rpkgteam/rcranbit
VcsGit: https://salsa.debian.org/rpkgteam/rcranbit.git
Homepage: https://cran.rproject.org/package=bit
RulesRequiresRoot: no
Package: rcranbit
Architecture: any
Depends: ${R:Depends},
${shlibs:Depends},
${misc:Depends}
Recommends: ${R:Recommends}
Suggests: ${R:Suggests}
Description: GNU R class for vectors of 1bit booleans
This GNU R package provides 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 onetime boolean operations
it can payoff to convert to bit, the payoff 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 one to work with preallocated memory for return values
by calling .Call() directly: when evaluating the speed of Caccess with
preallocated 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 (ff2.10 and higher).
