| Name : R-bit
| |
| Version : 1.1_12
| Vendor : obs://build_opensuse_org/devel:languages:R
|
| Release : 3.35
| Date : 2024-06-14 10:31:47
|
| Group : Development/Libraries/Other
| Source RPM : R-bit-1.1_12-3.35.src.rpm
|
| Size : 0.27 MB
| |
| Packager : (none)
| |
| 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).
|
RPM found in directory: /packages/linux-pbone/ftp5.gwdg.de/pub/opensuse/repositories/devel:/languages:/R:/released/SLE_15_SP3/x86_64 |
