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Paket: r-cran-bit (4.0.4+dfsg-1)

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).

Andra paket besläktade med r-cran-bit

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  • dep: libc6 (>= 2.17) [arm64, ppc64el]
    GNU C Library: Shared libraries
    också ett virtuellt paket som tillhandahålls av libc6-udeb
    dep: libc6 (>= 2.4) [amd64, armhf]
  • dep: r-api-4.0
    virtuellt paket som tillhandahålls av r-base-core
  • dep: r-base-core (>= 4.0.2-1build1)
    GNU R core of statistical computation and graphics system

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Hämtningar för alla tillgängliga arkitekturer
Arkitektur Paketstorlek Installerad storlek Filer
amd64 413,4 kbyte657 kbyte [filförteckning]
arm64 407,8 kbyte653 kbyte [filförteckning]
armhf 406,8 kbyte616 kbyte [filförteckning]
ppc64el 429,7 kbyte749 kbyte [filförteckning]