Swarm Intelligence

5.3 FFA hybridizations 103

• Agents with potential fitness: This group is handled as in the standard firefly

algorithm where each firefly is moved to the brighter fireflies.

• Agents with less significant fitness: The solutions in this population undergo the

evolutionary operations of the DE method. Mutation operation is performed on

the original solution generating a trivial solution v

i

according to the following

equation:

v = x

best

+ F (x

r1

− x

r2

) (5.26)

where x

best

is the best solution, F is a mutation constant, and x

r1

, x

r2

are two

random solutions from the group.

Offspring solution is produced by the crossover operation that involved the parent

x

i

and the trivial solution v

i

. The vectors of the ith offspring solution, yi, are

created as follows:

y

i

=

(

v

i

ifR < CR

x

i