Paquet : r-cran-bit (4.6.0+dfsg-1 et autres)

[ Paquet source : r-cran-bit  ]

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 r-cran-bit

Télécharger pour toutes les architectures proposées

Architecture	Version	Taille du paquet	Espace occupé une fois installé	Fichiers
alpha (portage non officiel)	4.6.0+dfsg-1	440,0 ko	715,0 ko	[liste des fichiers]
amd64	4.6.0+dfsg-1	444,2 ko	700,0 ko	[liste des fichiers]
arm64	4.6.0+dfsg-1	436,7 ko	716,0 ko	[liste des fichiers]
armel	4.6.0+dfsg-1	435,9 ko	714,0 ko	[liste des fichiers]
armhf	4.6.0+dfsg-1	436,1 ko	650,0 ko	[liste des fichiers]
hppa (portage non officiel)	4.6.0+dfsg-1+b1	437,3 ko	686,0 ko	[liste des fichiers]
i386	4.6.0+dfsg-1	446,2 ko	706,0 ko	[liste des fichiers]
ia64 (portage non officiel)	4.0.5-1	1 048,1 ko	1 468,0 ko	[liste des fichiers]
loong64 (portage non officiel)	4.6.0+dfsg-1	439,5 ko	714,0 ko	[liste des fichiers]
m68k (portage non officiel)	4.6.0+dfsg-1	435,6 ko	665,0 ko	[liste des fichiers]
mips64el	4.6.0+dfsg-1	439,4 ko	722,0 ko	[liste des fichiers]
ppc64 (portage non officiel)	4.6.0+dfsg-1	450,9 ko	782,0 ko	[liste des fichiers]
ppc64el	4.6.0+dfsg-1	450,4 ko	780,0 ko	[liste des fichiers]
riscv64	4.6.0+dfsg-1	441,1 ko	672,0 ko	[liste des fichiers]
s390x	4.6.0+dfsg-1	455,5 ko	739,0 ko	[liste des fichiers]
sh4 (portage non officiel)	4.6.0+dfsg-1	442,1 ko	713,0 ko	[liste des fichiers]
sparc64 (portage non officiel)	4.6.0+dfsg-1	435,9 ko	1 615,0 ko	[liste des fichiers]
x32 (portage non officiel)	4.6.0+dfsg-1	442,0 ko	686,0 ko	[liste des fichiers]