calc.sdcProblem {sdcTable}

perform calculations on sdcProblem-objects depending on argument type

Description

perform calculations on sdcProblem-objects depending on argument type

Usage

calc.sdcProblem(object, type, input)

## S4 method for signature 'sdcProblem,character,list'
calc.sdcProblem(object, type, input)

Arguments

object

an object of class sdcProblem

type

a character vector of length 1 defining what to calculate|return|modify. Allowed types are:

• rule.freq: modify suppression status within object according to frequency suppression rule

• heuristicSolution: obtain a heuristic (greedy) solution to the problem defined by object

• cutAndBranch: solve a secondary cell suppression problem defined by object using cut and branch

• anonWorker: is used to solve the suppression problem depending on information provided with argument input

• ghmiter: solve a secondary cell suppression problem defined by object using hypercube algorithm

• preprocess: perform a preprocess procedure by trying to identify primary suppressed cells that are already protected due to other primary suppressed cells

• cellID: find index of cell defined by information provided with argument input

• finalize: create an object of class safeObj

• ghmiter.diagObj: calculate codes required to identify diagonal cells given a valid cell code - used for ghmiter-algorithm only

• ghmiter.calcInformation: calculate information for quaders identified by diagonal indices - used for ghmiter-algorithm only

• ghmiter.suppressQuader: suppress a quader based on indices

• ghmiter.selectQuader: select a quader for suppression depending on information provided with argument input - used for ghmiter-algorithm only

• ghmiter.suppressAdditionalQuader: select and suppress an additional quader (if required) based on information provided with argument input - used for ghmiter-algorithm only

• contributingIndices: calculate indices within the current problem that contribute to a given cell

• reduceProblem: reduce the problem given by object using a vector of indices

• genStructuralCuts: calculate cuts that are absolute necessary for a valid solution of the secondary cell suppression problem

input

a list depending on argument type.

• a list (typically generated using genParaObj()) specifying parameters for primary cell suppression if argument type matches 'rule.freq'

• a list if argument type matches 'heuristicSolution' having the following elements:

  • element 'aProb': an object of class linProb defining the attacker's problem

  • element 'validCuts': an object of class cutList representing a list of constraints

  • element 'solver': a character vector of length 1 specifying a solver to use

  • element 'verbose': a logical vector of length 1 setting if verbose output is desired

• a list (typically generated using genParaObj()) specifying parameters for the secondary cell suppression problem if argument type matches 'cutAndBranch', 'anonWorker', 'ghmiter', 'preprocess'

• a list of length 3 if argument type matches 'cellID' having following elements

  • first element: character vector specifying variable names that need to exist in slot 'dimInfo' of object

  • second element: character vector specifying codes for each variable that define a specific table cell

  • third element: logical vector of length 1 with TRUE setting verbosity and FALSE to turn verbose output off

• a list of length 3 if argument type matches 'ghmiter.diagObj' having following elements

  • first element: numeric vector of length 1

  • second element: a list with as many elements as dimensional variables have been specified and each element being a character vector of dimension-variable specific codes

  • third element: logical vector of length 1 defining if diagonal indices with frequency == 0 should be allowed or not

• a list of length 4 if argument type matches 'ghmiter.calcInformation' having following elements

  • first element: a list object typically generated with method calc.sdcProblem and type=='ghmiter.diagObj'

  • second element: a list with as many elements as dimensional variables have been specified and each element being a character vector of dimension-variable specific codes

  • third element: numeric vector of length 1 specifying a desired protection level

  • fourth element: logical vector of length 1 defining if quader containing empty cells should be allowed or not

• a list of length 1 if argument type matches 'ghmiter.suppressQuader' having following element

  • first element: numeric vector of indices that should be suppressed

• a list of length 2 if argument type matches 'ghmiter.selectQuader' having following elements

  • first element: a list object typically generated with method calc.sdcProblem and type=='ghmiter.calcInformation'

  • second element: a list (typically generated using genParaObj())

• a list of length 4 if argument type matches 'ghmiter.suppressAdditionalQuader' having following elements

  • first element: a list object typically generated with method calc.sdcProblem and type=='ghmiter.diagObj'

  • second element: a list object typically generated with method calc.sdcProblem and type=='ghmiter.calcInformation'

  • third element: a list object typically generated with method calc.sdcProblem and type=='ghmiter.selectQuader'

  • fourth element: a list (typically generated using genParaObj())

• a list of length 1 if argument type matches 'contributingIndices' having following element

  • first element: character vector of length 1 being an ID for which contributing indices should be calculated

• a list of length 1 if argument type matches 'reduceProblem' having following element

  • first element: numeric vector defining indices of cells that should be kept in the reduced problem

• an empty list if argument type matches 'genStructuralCuts'

Value

information from objects of class sdcProblem depending on argument type

• an object of class sdcProblem if argument type matches 'rule.freq', 'cutAndBranch', 'anonWorker', 'ghmiter', 'ghmiter.supressQuader', 'ghmiter.suppressAdditionalQuader' or 'reduceProblem'

• a numeric vector with elements being 0 or 1 if argument type matches 'heuristicSolution'

• a list if argument type matches 'preprocess' having following elements:

  • element 'sdcProblem': an object of class sdcProblem

  • element 'aProb': an object of class linProb

  • element 'validCuts': an object of class cutList

• a numeric vector of length 1 specifying the index of the cell of interest if argument type matches 'cellID'

• an object of class safeObj if argument type matches 'finalize'

• a list if argument type matches 'ghmiter.diagObj' having following elements:

  • element 'cellToProtect': character vector of length 1 defining the ID of the cell to protect

  • element 'indToProtect': numeric vector of length 1 defining the index of the cell to protect

  • element 'diagIndices': numeric vector defining indices of possible cells defining cubes

• a list containing information about each quader that could possibly be suppressed if argument type matches 'ghmiter.calcInformation'

• a list containing information about a single quader that should be suppressed if argument type matches 'ghmiter.selectQuader'

• a numeric vector with indices that contribute to the desired table cell if argument type matches 'contributingIndices'

• an object of class cutList if argument type matches 'genStructuralCuts'

Note

internal function

Author(s)

Bernhard Meindl [e-mail]