Paquet : r-cran-bit (4.0.5-1)

[ 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 pour toutes les architectures proposées

Architecture	Taille du paquet	Espace occupé une fois installé	Fichiers
amd64	1 045,4 ko	1 352,0 ko	[liste des fichiers]
arm64	1 033,6 ko	1 379,0 ko	[liste des fichiers]
armel	1 032,4 ko	1 378,0 ko	[liste des fichiers]
armhf	1 035,4 ko	1 314,0 ko	[liste des fichiers]
i386	1 044,9 ko	1 366,0 ko	[liste des fichiers]
mips64el	1 034,1 ko	1 386,0 ko	[liste des fichiers]
ppc64el	1 048,1 ko	1 444,0 ko	[liste des fichiers]
s390x	1 041,7 ko	1 379,0 ko	[liste des fichiers]