rorutadis (version 0.4.2)

improveAssignment: Post factum analysis: improve assignment

Description

This function calculates minimal rho by which alternative evaluations on selected criteria have to be multiplied for that alternative to be possibly (or necessarily) assigned to at least some specific class (rho >= 1). Note! This function works for problems with only non-negative alternative evaluations.

Usage

improveAssignment(alternative, atLeastToClass, criteriaManipulability, necessary, problem)

Arguments

alternative

An alternative for assignment improvement.

atLeastToClass

Desired assignment.

criteriaManipulability

Vector containing a logical value for each criterion. Each value denotes whether multiplying by rho on corresponding criterion is allowed or not. At least one criterion has to be available for that manipulation.

necessary

Whether necessary or possible assignment is considered.

problem

Problem for which improvement will be performed.

Value

Value of rho or NULL if given assignment is not possible in any scenario.

See Also

deteriorateAssignment

Examples

perf <- matrix(c(8, 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 <- addAssignmentsUB(problem, c(1, 2), c(2, 3))

# a_1 dominates a_4 and a_1 is assigned at most to class C_2
# How many times evaluations of a_4 should be improved
# that a_4 will be assigned possibly to class C_3?
rho <- improveAssignment(4, 3, c(TRUE, TRUE), FALSE, problem)