How to always evaluate?

Matthew Wall mbwall at MIT.EDU
Thu May 20 19:15:00 EDT 1999

the 'evaluate' member of the population object is invoked by the genetic
algorithm object, typically in the 'step' method.  this is typically done
after all of the mating and mutating.

so the simplest thing to do is derive your own genetic algorithm and write
a new step method that does pop->evaluate(gaTrue) rather than

>As I was browsing through the documentation of GAlib last night, I saw
>that one can change the population evaluator, and if I want to "always
>evaluate" I could use the following evaluator :
>1 void
>2 PopulationAlwaysEvaluate(GAPopulation & p){
>3   for(int i=0; i<p.size(); i++)
>4     p.Individual(i).evaluate(gaTrue);
>5 }
>Especially the gaTrue at line 4 makes sure every genome is evaluated
>every generation.
>Fair enough to me, but now I have this new question... How do I tell
>Galib, or the running genetic algorithm, that it's population has to be
>evaluated with this population evaluator?
>thanks in advance,
>Anthony Liekens
>liekens at

Matthew Wall
mbwall at

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