The GA Procedure

Cross Call

  • call Cross ( selected, seg, type<, parameter1, parameter2, …> );

The Cross call executes a genetic crossover operator from within a user subroutine. The inputs to the subroutine are as follows:

selected  

is an array that specifies the solutions to be crossed.

seg

is the desired segment of the solution to which the crossover operator should be applied.

type

is the type of crossover 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 4.1.

Table 4.1: Crossover Operator Types

Type

Encodings

Parameters

'arithmetic'

real, integer

 

'cycle'

sequence

 

'heuristic'

real

 

'null'

all encodings

 

'order'

sequence

 

'pmatch'

sequence

 

'simple'

real, integer, Boolean

alpha

'twopoint'

real, integer, Boolean

alpha

'uniform'

real, integer, Boolean

alpha, p


The parameters are as follows:

alpha  

is a number such that $0 < \mi{alpha} \leq 1$.

p  

is a probability such that $0 < p \leq 0.5$.

The Cross call should be made only from within a user crossover subroutine. The precise action of these crossover operators is described in the section Crossover Operators.