By Attila Csenki

ISBN-10: 8776815145

ISBN-13: 9788776815141

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Extra resources for Applications of Prolog

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Greater flexibility is afforded by this additional argument. In the example query in Fig. 17, p. pl (see p. pl. – Finally, on return, the last argument is unified with the path found. 4: DepthFirst(StartN ode, G P red, C P red) comment: Depth First with Path Checking. Procedures are assumed available for • Testing whether a path is a goal path by using the procedure in G P red; • Finding successors of a node by using the connectivity procedure in C P red. procedure IsPath(list) comment: Returns a Boolean value.

15 The first argument of split/3 is redundant as it can be computed from Type . Not having to recompute it, however, will save computing time. 16 Prolog implementations of list rotation are discussed in [5], [8] and [9]. 4: Definition of square2/5 1 2 3 4 5 6 7 8 square2(Size,M,Total,Freq,Perm) :- var_matrix(Size,M), ad_partition(Size,Type), rep_perm(Size,Type,Perm), list_permute(Perm,M,P), transpose(P,M), distinct(M), eval_matrix(M,Freq), total(Freq,Total). Turning a challenge into a learning curve.

4 However, it turns out that the implementation does not work due to cycling in the network. The query shown below illustrates the problems arising. - path(s,g,Path). visiting node a visiting node b visiting node c visiting node b visiting node c ... Action (h for help) ? 2 Incremental Development Using an Agenda We implement Depth First search incrementally using a new approach. The idea is keeping track of the nodes to be visited by means of a list, the so called list of open nodes, also called the agenda.

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Applications of Prolog by Attila Csenki

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