PROC GA: Mutate Call :: SAS/OR(R) 9.22 User's Guide: Local Search Optimization

The GA Procedure

Mutate Call

executes a genetic mutation operator from within a user subroutine

The inputs to the subroutine are as follows:

selected	is an array that specifies the solution to be mutated.
seg	is the desired segment of the solution to which the mutation should be applied.
type	is the type of mutation operator to apply, which also determines the number and type of parameters expected.
parameter1-n	are optional parameters applicable to some operators.

The accepted values for type and the corresponding parameters are summarized in Table 3.2.

Table 3.2 Mutation Operator Types
Type	Encodings	Parameters
'delta'	real, integer	delta
		n
'invert'	sequence
'swap'	sequence	n
'uniform'	real, integer, Boolean	np

The parameters are as follows:

delta	is a vector of delta values for each component of the solution, used only for the Delta mutation operator.
n	specifies the number of solution elements that should be mutated for the Delta operator, and the number of swaps that should be made for the Swap operator.
np	specifies the number of solution elements that should be mutated, if np is integer; specifies the mutation probability for each solution element if $\text{[math]}$ .

The Mutate call should be made only from within a user mutation subroutine. The precise action of these mutation operators is described in the section Mutation Operators.

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