Package: bit
Title: A Class for Vectors of 1-Bit Booleans
Version: 1.1-15
Date: 2020-01-12
Authors@R: c(person("Jens", "Oehlschlägel", role = c('aut', 'cre'),
	             email = "Jens.Oehlschlaegel@truecluster.com"),
             person("Brian", "Ripley", role = 'ctb'))
Depends: R (>= 2.9.2)
Description: True boolean datatype (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).
License: GPL-2
LazyLoad: yes
ByteCompile: yes
Encoding: UTF-8
NeedsCompilation: yes
Packaged: 2020-01-13 08:46:07 UTC; ripley
Author: Jens Oehlschlägel [aut, cre],
  Brian Ripley [ctb]
Maintainer: Jens Oehlschlägel <Jens.Oehlschlaegel@truecluster.com>
Repository: CRAN
Date/Publication: 2020-01-13 08:47:57 UTC
Built: R 3.6.2; x86_64-w64-mingw32; 2020-01-13 09:45:29 UTC; windows
Archs: x64
