R-bit-1.1.14.tgz


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Description

R-bit - Class for vectors of 1-bit booleans

Property Value
Distribution NetBSD 7.1
Repository NetBSD amd64
Package filename R-bit-1.1.14.tgz
Package name R-bit
Package version 1.1.14
Package release -
Package architecture amd64
Package type tgz
Category devel math
Homepage http://ff.r-forge.r-project.org/
License gnu-gpl-v2
Maintainer -
Download size 217.04 KB
Installed size 276.32 KB
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 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).

Alternatives

Package Version Architecture Repository
R-bit-1.1.14.tgz 1.1.14 i386 NetBSD
R-bit - - -

Requires

Name Value
R >= 2.9.2

Download

Type URL
Mirror ftp.netbsd.org
Binary Package R-bit-1.1.14.tgz
Source Package R-bit

Install Howto

Install R-bit tgz package:

# pkg_add R-bit

Files

Path
/usr/pkg/lib/R/library/bit/libs/bit.so

See Also

Package Description
R-bitops-1.0.6.tgz Functions for Bitwise operations on integer vectors
R-blob-1.1.1.tgz Simple S3 Class for Representing Vectors of Binary Data ('BLOBS')
R-car-2.1.6.tgz Accompanies An R Companion to Applied Regression, 2nd Edition
R-carData-3.0.2.tgz Companion to Applied Regression Data Sets
R-chron-2.3.47.tgz Chronological objects which can handle dates and times
R-circular-0.4.93.tgz Circular Statistics, from "Topics in circular Statistics"
R-classInt-0.1.23.tgz Package for choosing univariate class intervals for graphics
R-cli-1.0.1.tgz Helpers for developing command line interfaces
R-clim.pact-2.3.10.tgz Climate analysis and downscaling for monthly and daily data
R-coda-0.19.1.tgz Output analysis and diagnostics for MCMC
R-colorspace-1.3.2.tgz Color space manipulation
R-combinat-0.0.8.tgz Routines for combinatorics
R-countrycode-0.18.tgz Convert country names and country codes
R-crayon-1.3.4.tgz Colored terminal output
R-curl-3.2.tgz Modern and flexible web client for R
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