The GA Procedure
- Overview
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Getting Started
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SyntaxPROC GA StatementContinueFor CallCross CallDynamic_array CallEvaluateLC CallGetDimensions CallGetObjValues CallGetSolutions CallInitialize CallMarkPareto CallMutate CallObjective FunctionPackBits CallProgramming StatementsReadChild CallReadCompare CallReadMember CallReadParent CallReEvaluate CallSetBounds CallSetCompareRoutine CallSetCross CallSetCrossProb CallSetCrossRoutine CallSetElite CallSetEncoding CallSetFinalize CallSetMut CallSetMutProb CallSetMutRoutine CallSetObj CallSetObjFunc CallSetProperty CallSetSel CallSetUpdateRoutine CallShellSort CallShuffle CallUnpackBits FunctionUpdateSolutions CallWriteChild CallWriteMember Call
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DetailsUsing Multisegment EncodingUsing Standard Genetic Operators and Objective FunctionsDefining a User Fitness Comparison RoutineDefining User Genetic OperatorsDefining a User Update RoutineDefining an Objective FunctionDefining a User Initialization RoutineSpecifying the Selection StrategyIncorporating Heuristics and Local OptimizationsHandling ConstraintsOptimizing Multiple Objectives
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Examples
- References
Objective Function
r = Objective ( selected, seg, type<, parameter1, parameter2, …> ) ;
The Objective call evaluates a standard objective function from within a user subroutine. The inputs to the function are as follows:
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selected |
is an array that specifies the solution to be evaluated. |
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seg |
is the desired segment of the solution to be evaluated. |
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type |
is objective function name, which also determines the number and type of parameters expected. |
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parameter1-n |
are optional parameters applicable to particular objective functions. |
The accepted values for type and the corresponding parameters are summarized in Table 3.3.
Table 3.3: Objective Function Types
|
type |
encodings |
parameters |
|
sequence |
distances |
The parameters are as follows:
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distances |
is a matrix of distances between locations, such that |
![$ distances[i,j]$](images/orlsoug_ga0039.png){kind=small}
The Objective call should be made only from within a user objective function. The precise actions of the standard objective functions are described in the section Objective Functions.