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[ 原始碼: r-cran-bit  ]

套件:r-cran-bit(4.0.4+dfsg-1)

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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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下載可用於所有硬體架構的
硬體架構 套件大小 安裝後大小 檔案
amd64 411。9 kB658。0 kB [檔案列表]
arm64 407。0 kB657。0 kB [檔案列表]
armel 405。6 kB640。0 kB [檔案列表]
armhf 404。9 kB620。0 kB [檔案列表]
i386 416。4 kB668。0 kB [檔案列表]
mips64el 407。8 kB672。0 kB [檔案列表]
mipsel 408。6 kB663。0 kB [檔案列表]
ppc64el 424。0 kB750。0 kB [檔案列表]
s390x 416。2 kB685。0 kB [檔案列表]