internals: Internal functions and methods

Description

These functions and methods are used internally and should usually not be called from outside the package.

Usage

begin(x, ...)
  nextPairs(x, n = 10000, ...)
  clear(x, ...)
  blockfldfun(blockfld, phoneticFld, phoneticFun, coln)
  getSQLStatement(data1, data2 = data1, con, type, blockFld, excludeFld,
    strcmpFld, strcmpFun, phoneticFld, phoneticFun)
  init_sqlite_extensions(db)
  .allows_extensions(db)
  .lib_path()
  getPatternCounts(x, n=10000, cutoff=1, withProgressBar = (sink.number()==0))
  getMatchCount(object)
  getNonMatchCount(object)
  getNACount(object)
  getColumnNames(object, withExcluded = FALSE)
  getThresholds(W, M, U, my, ny)
  countpattern(x, matching = FALSE)
  hasWeights(object)

Arguments

x, object

Depends on the function, usually a "'>RecLinkData", "'>RLBigData" or "'>RLResult". A matrix of binary observations for countpattern.

Maximum number of comparison patterns to fetch.

blockfld

Blocking definition as in RLBigData*.

phoneticFld

Indices of attributes for which phonetic code should be used.

phoneticFun

Name of phonetic function as in RLBigData*.

data1, data2

Data frame with records.

type

"linkage" or "deduplication", the type of linkage.

excludeFld

Indices or names of fields to exclude from comparison.

strcmpFld

Indices of attributes for which string comparison should be used.

strcmpFun

Name of string comparison function as in RLBigData*.

con

A SQLite database connection.

coln

Column names of records.

Database connection.

cutoff

Threshold from which string comparison values are rounded to 1.

withProgressBar

Whether to display a progress bar.

withExcluded

Logical. Wether to output names of excluded columns

W,M,U

Linkage weights, m- and u-probabilites. See emWeights for details.

W,M,U

Error bounds. See emClassify for details.

…

Optional arguments.

matching

If TRUE an additional vector is returned which stores which row belongs to which pattern.

Details

begin: Sends a query to the database of an "RLBigData" object which creates comparison patterns.
nextPairs: Retreives the next n comparison patterns.
clear: Closes the result set opened by begin.
blockfldfun: Constructs the part of SQL statement which implements blocking.
blockfldfun: Constructs the part of SQL statement which implements blocking.
getSQLStatement: Constructs SQL statement for retreiving comparison patterns.
init_sqlite_extensions: Load string comparison and phonetic functions into database.
.allows_extensions: Tests wether SQLite engine supports extension functions.
.lib_path: Gets path of shared library of package.
getPatternCounts: Counts binary patterns, implemented through countpattern.
getMatchCount: Gets number of matches from a "'>RLBigData" object.
getNACount: Gets number of pairs with unknown matching status from a "'>RLBigData" object.
getDbFile: Returns path of database file for a data or result object.
getColumnNames: Returns column names of a "'>RLBigData" object as a character vector.
getThresholds: Calculates upper and lower classification based on error bounds.
countpattern: Modified version of countpattern in package e1071.
hasWeights: Determines whether a data object has weights.