套件：r-cran-bit（4.0.5-1）
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).
其他與 r-cran-bit 有關的套件
|
|
|
|
-
- dep: libc6 (>= 2.4)
- GNU C 函式庫：共用函式庫
同時作為一個虛擬套件由這些套件填實： libc6-udeb
-
- dep: r-api-4.0
- 本虛擬套件由這些套件填實： r-base-core
-
- dep: r-base-core (>= 4.2.2.20221110-1)
- GNU R core of statistical computation and graphics system
-
- sug: r-cran-bit64 (>= 4.0.0)
- GNU R S3 Class for Vectors of 64bit Integers
-
- sug: r-cran-ff (>= 4.0.0)
- Memory-Efficient Fast-Access Storage of Large Data
-
- sug: r-cran-knitr
- GNU R package for dynamic report generation using Literate Programming
-
- sug: r-cran-rmarkdown
- convert R markdown documents into a variety of formats
-
- sug: r-cran-roxygen2
- in-line documentation for GNU R
-
- sug: r-cran-testthat (>= 0.11.0)
- GNU R testsuite