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[ Paquet source : r-cran-bit  ]

Paquet : r-cran-bit (4.0.5-1 et autres)

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GNU R class for vectors of 1-bit 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 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 one 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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Télécharger pour toutes les architectures proposées
Architecture Version Taille du paquet Espace occupé une fois installé Fichiers
alpha (portage non officiel) 4.0.5-1 1 038,2 ko1 379,0 ko [liste des fichiers]
amd64 4.0.5-1 1 045,4 ko1 352,0 ko [liste des fichiers]
arm64 4.0.5-1 1 033,6 ko1 379,0 ko [liste des fichiers]
armel 4.0.5-1 1 032,4 ko1 378,0 ko [liste des fichiers]
armhf 4.0.5-1 1 035,4 ko1 314,0 ko [liste des fichiers]
hppa (portage non officiel) 4.0.5-1 1 036,3 ko1 353,0 ko [liste des fichiers]
i386 4.0.5-1 1 044,9 ko1 366,0 ko [liste des fichiers]
ia64 (portage non officiel) 4.0.5-1 1 048,1 ko1 468,0 ko [liste des fichiers]
m68k (portage non officiel) 4.0.5-1 1 035,7 ko1 330,0 ko [liste des fichiers]
mips64el 4.0.5-1 1 034,1 ko1 386,0 ko [liste des fichiers]
ppc64 (portage non officiel) 4.0.5-1 1 047,4 ko1 446,0 ko [liste des fichiers]
ppc64el 4.0.5-1 1 048,1 ko1 444,0 ko [liste des fichiers]
riscv64 4.0.5-1+b1 1 043,8 ko1 336,0 ko [liste des fichiers]
s390x 4.0.5-1 1 041,7 ko1 379,0 ko [liste des fichiers]
sh4 (portage non officiel) 4.0.5-1 1 041,0 ko1 378,0 ko [liste des fichiers]
sparc64 (portage non officiel) 4.0.5-1 1 034,2 ko2 279,0 ko [liste des fichiers]
x32 (portage non officiel) 4.0.5-1 1 038,8 ko1 343,0 ko [liste des fichiers]