RoughSetKnowledgeReduction (version 0.1)

conditionReduct: CONDITION REDUCT

Description

User friendly constructor of an instance of the class Condition Reduct. Objects of this class can be created by the user or by objects of the class Decision Table.

Usage

conditionReduct(theDecisionTable, theColumnIds)

Arguments

theDecisionTable

A decision table object

theColumnIds

A numeric vector representing the column Ids of the decision table which conform the reduct. The decision Id columns is needed, which is always the last column.

Value

References

Pawlak, Zdzislaw 1991 Rough Sets: Theoretical Aspects of Reasoning About Data Dordrecht: Kluwer Academic Publishing.

See Also

ConditionReduct-class

Examples

exampleMatrix2 <- matrix(c(1,1,0,1,1,2,2,0,0,0,1,1,1,2,0,
0,0,0,0,0,2,1,0,0,1,2,2,2,1,1,0,0,2,2,2),ncol = 5)
dt <- new(Class="DecisionTable",decisionTable = exampleMatrix2)
cr1 <- conditionReduct(dt,c(1,2,4,5))
isConditionReduct(cr1) == TRUE# Test if cr1 actually is a condition reduct of dt
cr2 <- findFirstConditionReduct(dt)# Gets the first found condition reduct in dt
listCr1 <- findSmallestReductFamilyFromCore(dt)# Gets a set of the least condition reducts of dt
listCr2 <- findAllReductsFromCore(dt)# Gets all the reducts from dt