| Name : R-bit
| |
| Version : 1.1.15.2
| Vendor : Fedora Project
|
| Release : 1.fc31
| Date : 2020-02-25 10:15:50
|
| Group : Unspecified
| Source RPM : R-bit-1.1.15.2-1.fc31.src.rpm
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| Size : 0.38 MB
| |
| Packager : Fedora Project
| |
| Summary : Class for vectors of 1-bit booleans
|
Description :
True boolean datatype (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).
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RPM found in directory: /packages/linux-pbone/archive.fedoraproject.org/fedora/linux/updates/31/Everything/x86_64/Packages/r |
