Within the GA each control variable was represented by a
30 bit binary number (chromosome), or equivalently in decimal
integers between 
and 0. So,
when rescaled into real
numbers with a range of 3, this representation gives quantization
errors of just 
.
Figure 22 shows the progress in reducing the objective function for the same search. Both the fitness of the best individual within each population and the population average fitness are shown (note that the scales are different). These are the two standard measures of progress in a GA run. The difference between these two measures is indicative of the degree of convergence in the population.
