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[ 源代码: r-cran-bit  ]

软件包:r-cran-bit(1.1-14-1 以及其他的)

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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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下载 r-cran-bit

下载可用于所有硬件架构的
硬件架构 版本 软件包大小 安装后大小 文件
alpha (非官方移植版) 1.1-14-1+b1 215.6 kB313.0 kB [文件列表]
amd64 1.1-14-1+b1 216.0 kB305.0 kB [文件列表]
arm64 1.1-14-1+b1 213.5 kB301.0 kB [文件列表]
armel 1.1-14-1+b1 213.7 kB300.0 kB [文件列表]
armhf 1.1-14-1+b1 213.6 kB296.0 kB [文件列表]
hppa (非官方移植版) 1.1-14-1+b1 215.2 kB305.0 kB [文件列表]
i386 1.1-14-1+b1 216.5 kB304.0 kB [文件列表]
m68k (非官方移植版) 1.1-14-1+b1 214.1 kB304.0 kB [文件列表]
mips64el 1.1-14-1+b1 215.0 kB307.0 kB [文件列表]
mipsel 1.1-14-1+b1 214.3 kB306.0 kB [文件列表]
powerpcspe (非官方移植版) 1.1-14-1+b1 214.4 kB344.0 kB [文件列表]
ppc64 (非官方移植版) 1.1-14-1+b1 216.1 kB346.0 kB [文件列表]
ppc64el 1.1-14-1+b1 215.7 kB345.0 kB [文件列表]
riscv64 (非官方移植版) 1.1-14-1+b1 214.4 kB297.0 kB [文件列表]
s390x 1.1-14-1+b1 216.1 kB309.0 kB [文件列表]
sh4 (非官方移植版) 1.1-14-1+b1 215.1 kB300.0 kB [文件列表]
sparc64 (非官方移植版) 1.1-14-1+b1 214.5 kB306.0 kB [文件列表]
x32 (非官方移植版) 1.1-14-1 215.3 kB299.0 kB [文件列表]