## Description

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

Property | Value |
---|---|

Distribution | NetBSD 7.2 |

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 | 217.07 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-1.2.0.tgz | Simple S3 class for representing vectors of binary data ('BLOBS') |

R-brew-1.0.6.tgz | Templating framework for report generation |

R-callr-3.3.1.tgz | Call R from R |

R-car-3.0.3.tgz | Companion to 'Applied Regression' |

R-carData-3.0.2.tgz | Companion to Applied Regression Data Sets |

R-cellranger-1.1.0.tgz | Translate spreadsheet cell ranges to rows and columns |

R-checkmate-1.9.4.tgz | Fast and versatile argument checks |

R-chron-2.3.53.tgz | Chronological objects which can handle dates and times |

R-circular-0.4.93.tgz | Circular Statistics, from "Topics in circular Statistics" |

R-classInt-0.3.3.tgz | Choose univariate class intervals |

R-cli-1.1.0.tgz | Helpers for developing command line interfaces |

R-clim.pact-2.3.10.tgz | Climate analysis and downscaling for monthly and daily data |

R-clipr-0.7.0.tgz | Read and write from the system clipboard |

R-clisymbols-1.2.0.tgz | Unicode symbols at the R prompt |

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