Grammatical Evolution Rules: The Mod and the Bucket Rule

We present an alternative mapping function called the Bucket Rule, for Grammatical Evolution, that improves upon the standard modulo rule. Grammatical Evolution is applied to a set of standard Genetic Algorithm problem domains using two alternative grammars. Applying GE to GA problems allows us to focus on a simple grammar whose effects are easily analysable. It will be shown that by using the bucket rule a greater degree of grammar independence is achieved.