Description Usage Arguments Value See Also Examples

This function allows to obtain explanation of an alternative assignment to a specific class interval or one class in case if assignment is necessary. The function returns all preferential reducts for an assignment relation.

1 | ```
explainAssignment(alternative, classInterval, problem)
``` |

`alternative` |
Index of an alternative. |

`classInterval` |
Two-element vector |

`problem` |
Problem for which computations will be performed. |

List of all preferential reducts for an assignment relation.
If the assignment is not influenced by restrictions then empty list will be returned.
Each element of the list is a preferential reduct represented as a vector
of restriction indices. To identify preferential core use
`getPreferentialCore`

.
To find out about restrictions by their indices use `getRestrictions`

.

`getPreferentialCore`

`getRestrictions`

`calculateAssignments`

1 2 3 4 5 6 7 8 9 10 11 12 13 | ```
perf <- matrix(c(5, 2, 1, 7, 0.5, 0.9, 0.4, 0.5), ncol = 2)
problem <- buildProblem(perf, 3, FALSE, c('g', 'g'), c(0, 0))
problem <- addAssignmentsLB(problem, c(1, 2), c(2, 3))
possibleAssignments <- calculateAssignments(problem, FALSE)
alternative <- 4
assignment <- c(min(which(possibleAssignments[alternative, ])),
max(which(possibleAssignments[alternative, ])))
preferentialReducts <- explainAssignment(alternative,
assignment, problem)
preferentialCore <- getPreferentialCore(preferentialReducts)
coreRestrictions <- getRestrictions(problem, preferentialCore)
``` |

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