By Antoni Niederlinski
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Extra resources for A Quick and Gentle Guide to Constraint Logic Programming via ECLiPSe
Why are present-day tools for solving combinatorial CSP and COP, outlined in this book, better than exhaustive search? e. generating one by one all n-tuples of the Cartesian product of variable domains and testing whether they satisfy all constraints of the problem. 2 Why use Constraint Logic Programming? 2: Simple CSP example with unique solution. 1. Because of the numerical eﬀectiveness of determining CSP and COP solutions, which for exhaustive search and large numbers of variables is very bad indeed.
It so happens that Prolog and CLP excel in almost all those features and activities that are crucial for knowledge engineering. Perhaps the most important is the ability to present knowledge in a declarative form using logic and mathematics, and apply this form for computer assisted reasoning, aiming at proving or disproving some statements. g. g. [Morgan-08], [Ross-03], and [von Halle-02]). 7 How to use the book? The reader is encouraged to solve all examples discussed in the book, in their original version and in any conceivable modiﬁcation, as well as examples provided in the Exercise sections.
1 Prolog basics 31 /*4*/ /*5*/ /*6*/ top:- /*7*/ membership(Member,[Member|_]). /*8*/ membership(Member,[_|O]) :- /*9*/ fail. "). membership(Member,O). generates the message: 1 2 3 4 Those are all elements of the list. The programs query is top. Prolog compiler attempts to satisfy the query. In order to do it, it has to satisfy the predicate in line 2. This invokes the deﬁnition from line 7, E is grounded to 1, and because of the other part of the deﬁnition (lines 8 and 9, a choice point is created for the predicate membership().