
144 Optimization: Algorithms and Applications
ones are eliminated. This can be achieved using Roulette wheel or tournament
selection. In the rst approach, roulette wheel slots are sized in proportion to
the tness value of each string. The wheel is spun and the string to which it
is pointed is picked up. This is repeated until all the population is lled up.
The roulette wheel selection procedure is suited for objective functions of
the maximizing type. Because in the test problem the objective function is to
be minimized, we have to suitably convert the tness values so that roulette
wheel selection procedure can be used. This is a two-step ...